1.自己写一个计算器demo

知识点：

1.System.Math.Pow() 实现乘方

2.实现计算器的运算优先级，依次调用的流程

问题：

还未实现“()”功能

解决方案

UI:

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" alt="" />aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAANUAAADSCAIAAABSJxJsAAATLElEQVR4nO2dz2scRxbH85c0JBCCpKMPvtrjy8Ai9qybDBHkOH3YPQQnYHBkJJ+WdohklMPYGOWyHoQZxpvDkEWbDQIxe4gHNlHi/Bo7sda7sq24D0GQPXR3df14VV3dXVNvfrwvhdD0dFdXd3+mXtX0t9+8dnx8cnLy8uTk5RmJZNSdO3dCUTdv3vztt9+Sd3///XebShLYWHnNxN+gne2oPXBzCIN2uNEbGd8v3mNRJUyj3oblmsamlDl+67aV0ai3wbVg1NvImlWwK9vGDNph4TpffPFFGIbvvvvu4eHh8fHxl19++f7774dh+ODBg2QF1/zxBz3q9dwAaDwjtns0n1ZXBFSrZwz8jXobrMpRbyMUUOwNDDu1b0zxSrdu3QrD8PDwkC05OjoKw3BjYyN56Zq/sXySjZWW+LjOEX8cfmI/WLxTl425evVqGIbPnj3jFya9cPK/8/g7aKsdfN73p+dBCZiDdrjRbrNPqbTBoB1u9AbpMuXcmPfITj07rfz5Tf7ngmZ7IKygq6fX1oQy6eJxsTx9BzyW4j3mJ0c+mdKpY/s14wccclaJegji5mX43NraCsNwOBzm1Y1GYRh+8MEHyUvGX6/X48eIvV6Pr6fM+C87Q8qFPzsbtMWW80wIV0BZLeRWVM+musfs/7wyA3+GhWA93KWXG8OP/9hKyUXNt0lrgtsG7xEgNT2Z0Mcv350YiOV1+EOGdpFuX52/Tz75JAzDq1evPnr06OzsbDQaXb9+PQzDvb29ZAW+/+t0OsmJ63Q6Uj0qf/8rmP+yMQf3gRYuijAYljoA9aKqcJj3mNeQXYry/BXUAzYGah5HrLSCXGfhHoGTCZ4QkT94IqQ7EL4xoXrp7NXv90NI169ff/XqVbKOFH87nY4K31kV/tiBq8efL2GfTRf8afY4wfyxHZTiz3ByzuRNNdsoGxoOSun/7MTDt7W1dePGjSTs7u3tMfjOKo//nur4G/T4kwsHCHaAQAA608Rf/SXX7JGLYvk4ie2VG4fax1+pHqgx8BI5/qZrAHXa7NFwcpjEoCt8AMD5r2P++MGcNJKT5Jo/eWCbHYKwMHu90W6r/Z9YiV2XY9gjtCHbot1mC9Nl2vmHzaUSGxOmEw3xs8ZG+nx77feonkw4IMijPn4r6TTIlRSN74ret4fvbAz8kcwqM3qvI+20o674oSW4gmEaoaoqf0+Jv2ryxZ9h4lFLOX4D/f0P3TRCFfHnWf74mwoRfyRMEX8kTBF/JEzV5Y8KFf+F+KOCWXL+YhJp/JL5+4X4I3kU8UfCFPFHwhTxR8KUyt9/S/HXsNZYD4M0pVL4+4X4I/kTNn/dVpCq1dXupNsKmtHQojXDqGm5JrgXYdNh1MyaVrlKVrNNFeUbn5+86i2VjpprS3JBuq36xy/WK9TmgL/nJy8KC8xffpRxPIwiLYDm62dNZ4G4KzGMmvwHwtQ2u5q1LXTS+LKV8OtD/A2jZjMapmeh5ej0wkLlz/a8eeaP/1g40ZTxl+LnsoVaOebv9PT09PT0xfOXVvyBnTsX9zII2CkQT1zQjIZcCGp1hRV09UStglClxw8aLOS7aXXBFgoLxRpcNV5BRGqU8FraKXj8fG06/rqtoBl104qzNbqtoNlqZcHDdCnTd+vyd//+/dPTUwbf+vr6ysoKv9DIX95Grn3Z//lYwcCfYSFYT8ANazR9nHT+AbG9qEO2whaOo/FS/dzLpHfrtsRjLYwnhsr55YFyGvgOxepS1uVvfX19fX096fbW19f52YYdf6x9Qasr9z3ZmSjPX0E9htNqDL953wHsRakWaqFUg5vGiy+5Xif9ZA+jptBluuIvXw400nwUWSNl/n6uNP9NKGw0Gp17nSr8sdZOAn86APPFWQ9Zlj+1hnHxp2k+MEhQVYE/tstS/LW66vivAn+Muc69ToKaLX/diD+AZjRUOm0Wb/KOPn037+ltQphUj+G0ssqV+S8QddX4a2whUIOTxqsv4WPLqDfzZz/+y97QNtJwFOnmqPzJA3DWVmmQDcUv7nuBdFmrK6xprqfgGohRjDvNQRAEzVarKZxl4QiAFgrcSTW4aLxyLHzjW11tGzWjDL57zyWfrW421dBMLwqPApx/OIy/dP9jWlU8A4uLP8DarQTqFf5+rjL/YP8TbbMhi69AK/GnbFSXP0ns+5dqm5OmRyX5S2OxvIlj/kikUiL+SJgi/kiYUvl7RvyRvEnm7wnxR/IoHP7Ob56zLGNtBgldaPzZuAYN/AG3J6qJs3E4WxNoo4u2cndwZ0bO+Hv48KH9yjX5S24fsXs+0fj4428El+YvVYJN6Q2Fe9DQjcqZkBv+9vf3FxcX7ddn/Kn3jtlfLX9uuwEjVSLoFVWNP2DX1P+B2t/ff/PNN4MgsN8k4S+B7/HoyfOTF19/dSTdL9bxB18FMB5LjxBJjknOg9yMhmoNXJ+T38UXXQOBvKTZbCpxFuAPaK3Qw8m7Nh35dKsufwy+Cvw1Go3P//G5ZJMp7P8KwqDEk+xL0vMHrSZ0Qmw5t1Sqh/dWStiI9k/RGJ8Cp7ZiDvu/JyX44+Grz59l/6eNiWJvB/Q6hfwpj1yC/AkLWUUKlFIvLHiFJbW6bM+Sr4v400qCrwJ/29u3+PhrO/6DOsC898neBS6WkT+1hng8/GmHg4xLLvoTf7AePny4uLgofYzt98rmHwmCjUbj0799aj3/lR9ZitLHsMSoq4m/zAYu8gfVIF1xMf6CHFv1f2rzoSECABvx50q1v/8TvlrLx2TZBEATTzk/blOJv2ANbKnl/MOGP1Pz+RW5XStfJc4MhFPKH2lGJPP32Bd/dP+NFGPxRyIlIv5ImCL+SJhS+fsP8UfyJuKPhCmFv8fEH8mffPO3v7/vsLZ+v7+yspLcQdnZ2XFYM8mPfPO3sLDgCsF+v8/MCiwHg178bf9ajukSUvMTkUT55i8IgqWlJScIsp6Ph0/fC+bP64+ZimqJUeZUCPx1Oh0nCKqdX5KARrN6meRXtUT8lZDM32j8/MVx7ARB3izIEnCV5I8lEeOMA8IN/i6U5VhNsCwkI+PeAVOq8dbTmTITVBAOf3Ecb25uLi0tPX36tHJVDUgrKyua1cH4y6dqlPIlcg7A3Gsl5fOL4zR9vFQPDLqwiZyIbE6Fw9/+/v7S0lKn06lcz9tvvw3y1+/3NVvw8w925aX+KSeiC2S9zRaqCZa1wT37vzgn85wKgT+38C0vL7OeTw9frBmWleIvW8M27XMs8qd9ZGCe+0EE/hzCZ/G1C1MRf3L8ZQM7PmwrC+F6wPgL93ZWuUZnV775e+ONN+rAF0PTXjsV8qfNV6xkOVYSLCth2jj/gHMyz6d881cTvpjLOO2kPUWiL1PGK4W/Ed3/5UX8jVfEn1nE33hF/JEwpfJ3TPyRvEnm7yfij+RRxB8JU8QfCVO++XPrfyZNu3zz59D/XFJwTkftivStixf55s+h/5lJdcFAawkOKD2BpvdIzoXAX2XzqY6w0vyZvlWmL5y9CoG/uKr/2Rl/sqkKMAUoGdwkn7Pkl87fjaKWUANUC3mhmRT+fvLBX1zJ/ywRJv1jwZ86+gOdzFA3afY5c+9yFq2cLa1Za+690Dj8VbOguun/eCuo2clc512D85S80JwQ+Kvsf3YVf3PLp9nJXOfdAv7IC50Kgb+a/mdVNeYfhU7mOu/Kjy1xq5EXOpXM349j5q++/7mqhIltDoXRyVzjXZlUzfxj3r3QvvlDgo80ofLNH4nEi/gjYUrl7ynxR/Im4o+EKeKPhCnij4Qphb8fp4A/9QtnX4+jkxxrRvgjBKdUU8yf9MPplgji+0uZv5qyQ6v8/TDN/BUjOIyazVYL8y4rPv8Tpank7+DgoN/vv3j+Uvq9Vr35IFVygx/1Nj/5qwVNGX8HBwe7u7txHO/u7h4cHEgIFvGXgScACGZ41qR9FqrSWgqy7k21Q0v+asBN2IyiuQJ0yvhbXl5OfmFhZ2dneXn5119/LcGf4PsTzSlAhmd1IV8RYKniQOQqke3QWhsY58Qn/iaVv0b2O0c7OzuNRuPV6St7/njoOA8olOEZXshVZLSUQpVAich5j6rUHxN/2A2DxbI9NxqNkv2f8PwvFyehDM/wwkzEnztNGX8HBwcJgsvLy+XGf/Jl5VEzZngWFposzVz8NYdair+5poy/OIu8Ozs7yT925nugV8k4ATM8axdaWJoLE5HDz9dlG9P8Yxb508siL7lPaZ5OmlUp/P0w6fzt7u42Go3kWxgXmiz+tM8mzahU/n6ZcP5caxL4kx9kmh/J/H0/d/yRMEX8kTBF/JEwRfyRMEX8kTDlmz/K/0zi5Zs/vPzPibhvOup+wTJfN2rHJN/8BS7yP994sHF+81xSPvrswziOz2+eY3+1GkZN/uu1YRTV+qqNkvg6EAJ/lfM/J0rg++PWHz767MMbDzY6g78yFpOi2c75jS3iz4EQ+Iur5n9OdH7z3KW/XDg+OZYWxub+T48flP1MsjcXOAnEGpREvxprdJ5HWmwlt+bs54VW+PveB39xpfzPic5vnnvn7pq0pLj/K37ow2yvMjtZDG9prdFKc5T9zkFeaJm/77zwVzkFbzyG/k9+KsMysS7kngrUt4qtqfoWzoEZEIG/OvDFcfzO3TV+/Hfnn2277Qxpl1mYrMSfWoMr/tji+Ym/Hvirmf/5+OQ4QTAp1vwJzwPFcTb/BaKuGn/Fx0Uk/oAaDPHXYI3WPo8+w3mhffOHl/85jmPR6MT564MgCITn0pU5CVvQainxF6ghXV2ef5it0cp+5yAvtG/+KP8ziZfK3890/5fkTcQfCVPEHwlTxB8JU8QfCVPEHwlTMn+PviP+SP7kmz/yP5N4+eYPz/8s5L/ycT+B0jtbyDd/eP5n8oROohD4Q/I/E3+TKAT+YhT/s8wfFx3Td7SJoHOjsuxHNtuVgfTOkgVazA4taS680Dj8xf79z8L4j5mgWt3cZKxNBC0kJc/+TYnlWZDtykB6yaLs0Ezz4oXG4Q/B/wzGX8ERWJQImvduJZtJ/mTZrqwaVDU1q22bGy80An9I/udS/EGJoO38ydxLp/xB+5oB4cx/MfzP4ONCcvzV53wWVxAl+ZOzl7r4a7BAz50X2jd/eP5n4fu/ZKIhXurCnM9KnkjJnyzblcHYXSo79Ox7oX3zN8H+Z/qCBkEyf98+ejKv93+JPwQRf0zEH4KIPxKmtPwdDo6oUBl3If6oYJap4a9sx47eYCo2ZZr4A39tS/cTXOgNpmJTfPN35+69ahsSfzNZfPP31ltvVUOwNn+3V7n7Hxfe67s5ou21ILh05T7+hZzS4pu/IAgWFhYrIJjwx//ar67o+XMLSv/KxSC4vOa62vkqCPxFNz+ugCDIn9rzeeRvrNXOS5H5++bbsfN3ODiqgCDjT0JNwrEcf/evXcgi8up2vtrq5UtBsLaVbLKdrrO6fbT33iUlfBv461+5yFcuvaRydIjF3+Hg6E9/vrKwsPj3/X9Zbuii/8u1up0uSVG4f+1CitHt1Ryv26tBEFy8tjdIxnnZ8u21IFjbyqsF+etfuSiOMrfXgsu30a/3pBUc/u7cvbewsBjd/Nh+Q/fjv/vXLuQYHW1dZlCy1cr+r608W+Ju3jMrBYG/CvAdjmP855m/wdHhII3gFH9ZQeCvAnyHYxn/SfE3waUmf+ylEn+zsvfeJeoFWfHN3+uvv14BvsMxzX/z+UcF5vL5RMCGifJq3HBzey17BfSLc1tU/h6Plb9q8B06GP9RmcTim7/Khe6/zWSZJv7I/zJ7ZWr4ozKThfijgllk/o4y/srGOxKpghT+viH+SP5E/JEw5Zs/yv9M4uWbv8nI/0zPmU+KfPMXTED+Z0oMPjlC4G8C8j9Tqo1JEQJ/MX7+ZyHfGZTeWfiZ9CwjdARuBf1UdZ5HOsuSqov6c5Hk2SAc/mKc/M9q/JXSO8NZmrlc42pSaLV+Lo809+88J3k2CIc/pPzPQSB3Ltr0uikJQrZRMEskXzGYQ5KSPJuEwN8E5X+uz1++FVu1Bn9s8dzG36+9zH8nI/9zrPABZmkG46/ymwxCyLZMsjsvSZ4NUvkbjZU/1PzPZv7ALM15eJXmH3ym/CAIgmarZdv/zV2SZ4MU/o7Gy98E538ukiZckurIN3/TK+2vL5BqiPgzS/rFBZJjEX8kTBF/JEwRfyRMEX8kTBF/JEz55o/8zyReMn9fjZk/LP+z8OuXBR5ocgf6k2/+8PzPiWzYIv78CYE/JP9zIuJvsqTw9/XY+Ytx/M+JQBOUdH9DdJJy7hdurW4rMSSQsbmecPiLEfzPiST+dJ7nZjTk7QaC4aoZDQU0ydhcQzj8YfifE6mGK8VzGndbQbPJA8TfBM6dUmRsdiAE/pD8z4ks+QuaTe4dwHlFxmY3Uvn7aUb9z4nM8Zcb2w0ll7OEGBmb3cg3f3j+50SG+YfKExc1ZR8WGZvdyDd/U+x/Jo1BvvkjkXgRfyRMyfz9m/gjeRTxR8IU8UfClMLfV8QfyZ+IPxKmiD8Spog/EqaIPxKmiD8Spog/EqaIPxKmJP7+D8RVpC/E/2gsAAAAAElFTkSuQmCC" alt="" />

 

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;

 namespace CaculationTest
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button_Click(object sender, EventArgs e)
         {
             var text=((Button)sender).Text;
             if (text == "=")
             {
                 Evaluate();
             }
             else
             {
                 txtExpression.Text = txtExpression.Text + text;
             }
         }

         private void Evaluate()
         {
             txtExpression.Text = new Caculator().Evaluate(txtExpression.Text).ToString();
         }

         private void button16_Click(object sender, EventArgs e)
         {
             txtExpression.Clear();
         }

     }
 }

Form1.cs

 using System;
 using System.Collections.Generic;
 using System.Text;

 namespace CaculationTest
 {
    enum TokenType
    {
        Add,Sub,
        Mul,Div,
        Int,
        Expo,
        Start,End
    }

    class Token
    {
        public TokenType Type;
        public object Value;

        public Token(TokenType type , object value = null)
        {
            Type = type;
            Value = value;
        }
    }
 }

Token.cs

 using System;
 using System.Collections.Generic;
 using System.Text;

 namespace CaculationTest
 {
     /// <summary>   </summary>
     abstract class Expression
     {
         public abstract int GetValue();
     }

     class UnaryExpress : Expression
     {
         int _value;

         public UnaryExpress(int value)
         {
             _value = value;
         }

         public override int GetValue()
         {
             return _value;
         }
     }

     class BinaryExpression : Expression
     {
         TokenType _tokenType;
         int _left;
         int _right;

         public BinaryExpression(TokenType tokenType, Expression left, Expression right)
         {
             _tokenType = tokenType;
             _left = left.GetValue();
             _right = right.GetValue();
         }

         public override int GetValue()
         {
             switch (_tokenType)
             {
                 case TokenType.Add:
                     return _left + _right;
                 case TokenType.Sub:
                     return _left - _right;
                 case TokenType.Mul:
                     return _left * _right;
                 case TokenType.Div:
                     return _left / _right;
                 case TokenType.Expo:
                     return Convert.ToInt32(Math.Pow(_left,_right));
                 default:
                     throw new Exception("unexceptional token!");
             }
         }
     }
 }

Expression.cs

 using System;
 using System.Collections.Generic;
 using System.Text;

 namespace CaculationTest
 {
     /// <summary>   </summary>
     class Caculator
     {
         string _exp;

         int _pos;
         Token _token;
         int _len;

         public int Evaluate(string expression)
         {
             _exp = expression;
             _len = expression.Length;
             var exp = ParseExpression();
             return exp.GetValue();
         }

         Expression ParseExpression()
         {
             //先解析一次，解析内容存在_token中
             ParseToken();
             return ParseAddSub();
         }

         //解析加减
         Expression ParseAddSub()
         {
             //左操作数为优先级理高的运算符
             var l = ParseMulDiv();
             while (_token.Type == TokenType.Add || _token.Type == TokenType.Sub)
             {
                 var t = _token.Type;
                 ParseToken();
                 var r = ParseMulDiv();//解析右操作数
                 l = new BinaryExpression(t, l, r);
             }
             return l;
         }

         #region 老逻辑
         ////解析乘除
         //Expression ParseMulDiv()
         //{
         //    var l = ParseUnary();
         //    while (_token.Type == TokenType.Mul || _token.Type == TokenType.Div)
         //    {
         //        var t = _token.Type;
         //        ParseToken();
         //        var r=ParseUnary();
         //        l = new BinaryExpression(t, l, r);
         //    }
         //    return l;
         //}
         #endregion

         //解析乘除
         Expression ParseMulDiv()
         {
             var l = ParseExpo();
             while (_token.Type == TokenType.Mul || _token.Type == TokenType.Div)
             {
                 var t = _token.Type;
                 ParseToken();
                 var r = ParseExpo();
                 l = new BinaryExpression(t, l, r);
             }
             return l;
         }

         //解析乘方
         Expression ParseExpo()
         {
             var l = ParseUnary();
             while (_token.Type==TokenType.Expo)
             {
                 var t = _token.Type;
                 ParseToken();
                 var r = ParseUnary();
                 l = new BinaryExpression(t, l, r);
             }
             return l;
         }

         //解析一元表达式（目前只有单个整数）
         Expression ParseUnary()
         {
             Expression ret = null;
             if (_token.Type == TokenType.Int)
             {
                 ret= new UnaryExpress((int)_token.Value);
             }

             //解析完int后，移到下一个token处，即+-*/
             ParseToken();
             return ret;
         }

         void ParseToken()
         {
             //已结束
             if (_pos >= _len)
             {
                 _token= new Token(TokenType.End);
                 return;
             }

             //跳过空格
             while (_exp[_pos] == ' ')
             {
                 _pos++;
             }

             //如果以数字开头，解析整数
             if (_exp[_pos] >= '' && _exp[_pos] <= '')
             {
                 for (int i = ; i + _pos <= _len; i++)
                 {
                     //如果以数字结尾，或者到达了数字的边界
                     if( i+_pos==_len||(_exp[_pos + i] < '' || _exp[_pos + i] > ''))
                     {
                         var intStr = _exp.Substring(_pos, i);
                         var value = int.Parse(intStr);
                         _token= new Token(TokenType.Int, value);
                         _pos += i;  //解析成功后，更新当前位置
                         break;
                     }
                 }
             }
             else
             {
                 switch (_exp[_pos])
                 {
                     case '+':
                         _token=new Token(TokenType.Add);
                         break;
                     case '-':
                         _token = new Token(TokenType.Sub);
                         break;
                     case '*':
                         _token=new  Token(TokenType.Mul);
                         break;
                     case '/':
                         _token = new Token(TokenType.Div);
                         break;
                     case '^':
                         _token=new Token(TokenType.Expo);
                         break;
                     default:
                         throw new Exception("unexpected token: " + _exp[_pos]);
                 }
                 _pos++;//解析成功后，更新当前位置
             }
         }

     }
 }

Calculator.cs

验证结果

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uMarW6ZAXVapV2B0LYUGGbOjsPqZNhzrnaELkDDdDZnC0irNnT2XkgGe1skTvQdsKaPZ2dh9TJuGMFIncghI0Ttqmz85A3GbquL3KSHFNW/VJWNjzF+xKLi7qu0+5AgnCrszKWJCw3X3hqWGBzBYRFnOve5B0WcXYejkrGKpJjCumiNvUOTI4py7fe1DA1GqYKr2hODVOjYXoyWv4qoWYDyWgidTIKAsSHlOA8ZaHIHch9svmg0tCMD7GhuOzCLb6F+aBipjB9kwvLm0veYRFn5yF1Mm6TmQsqSnCOtFTkDhQQjQ+xobj8wvEhtryxc0GF0fZYMBmEM4qDZDSRNxmVSmWBSmLU7Z0krq1UKrQ7kCicGHUzxph7NGEP4Ulv/UN8t9frpknThIU2WRiys/NwZDImvYxcDHPvwMRo47ZbOZJauIVJL7FzSIatkToZaRIzAZcrMENbm06nRe5AEVWytpnCq93ZgQnKSsFkCDjTQTKaSJ2MFIXpgMsVmCYtTaVSqZTIHch9sgkPW5adDriYZ0J24RXLCQ8j+hKF6ZvcC5CMJvImo1wu3yQw7mGeccrCBuVymXYH0oTHPY3//6NqWyVM3maasIizOGRn5+G4ZFh0cUDYaGGbOjsPqZNxwwpE7kAIGydsU2fnIW8ySqXSNSsolUq0OxDChgrb1Nl5IBm9uTggbLSwTZ2dh9TJuGoFIncghI0Ttqmz85A3GcVi8YoVFItF2h0IYUOFbersPCRNhqqqmUymUChcNpdCoZDJZGg/fRfChgrb1Nl5SJqMcDgciUSy2WzRXLLZbCQSCfP/+HkIGy1sU2fnIWkyNE0LhUKqqvrMRVXVUCgEYTmFbersMORNBgBAQpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABzIm4xoNOr3+03+oh2/3x+NRiEM4Z4IOxJJk3E0HI7FYrlcrmYuuVwuFosd5f/SYAhDeIsgaTJUVc3n87qu3zUXXdfz+Tztu7wgDOGtgKTJ8Pl8tVrN5IujTq1W85G+lxzCEN4KyJuMarW6ZAXVapV2QUMYwlsBqZNhzrnaELmgDdDZHAgbDZLRCpLRzha5oCHcPUhGK1In444ViFzQEIaw45E3GbquL/IzNdz45WPDU4Tli4uLuq7TLujuhZNjCmvTbH2IU98E4d5ikXByTCFeEzRhp+KsZCTHFGUsufrInOuje+HkmMJW1KaG63Wg+yIZ3TE1TN1gJGMVUiejwEt8iA3F1xzyIXJBd/Hy80FFCc53+7AEwr3HCuH5oEK7HOjCTkXqZNzmZC6oKMG5tcdciFzQfIrdPG65sAFYIBwfou4uXdipyJuMSqWywEli1O0eTaw95qJSqdAu6K6E19NKjLpXfSrDOymJcBuTXqKlVcILCwsLiVE3zVRI2KkgGb25PnqQDJquBXegKGYLT3qpWysk7FSkTkaal4kD7MDEmkM+RC7oLl5+JuByBWa6fVgC4dVMHGj9KEPKHW5jJuCiaYoKOxWpk5HiZTrgcgWmVx/xInJBd+nIVtQmPIx5JkR8DRfuOaYKT3io+yoq7FTkTUa5XL7Jz7in8TegZ5yw/ObNm+VymXZBdy98/pCLtWm2PsQYY8x16Lw8wr3FROFxD/k6EBZ2Kk5Lhji4AyHcE2GnInUybliByAUNYQg7HnmTUSqVrllBqVSiXdAQhvBWAMnozfUBYQhvEaROxlUrELmgIQxhxyNvMorF4hUrKBaLtAsawhDeCkiaDFVVM5lMoVC4bC6FQiGTydB+mC2EIbwVkDQZ4XA4Eolks9miuWSz2UgkEub/CfQQhvAWQdJkaJoWCoVUVfWZi6qqoVAIwhDuibAjkTcZAAAJQTIAABwgGQAADpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABwgGQAADpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABwgGQAADpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABwgGQAADpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABwgGQAADpAMAAAHSAYAgAMkAwDAAZIBAOAAyQAAcIBkAAA4QDIAABwgGQAADpAMAAAHSAYAgAMkAwDAAXcyMBgMpjlIBgaD4RgkA4PBcAySgcFgOAbJwGAwHINkYDAYjlmVjGe+KGEwGMwGsyoZAACwMf8PzlirNtKoi44AAAAASUVORK5CYII=" 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" 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vCBu1sPmRxhMfj8Xq94XA4oS3hcNjr9XrUv0r6c3/+YOve05f/kYikslrm8j8SW/eefu7PH5h+wgbtbD5kcUQ8Hne73Yqi2LVFURS3200r3PTq4dUdRzV+D57VHUeb1L+5hkEnbNDOJkMiRwAAJASOAADwgCMAADzgCAAADzgCAMADjgAA8IAjAAA84AgAAA+JHOHz+RwOh8b/LeNwOHw+HwrLWdignU2GLI7Y5fH4/f5IJJLVlkgk4vf7d6n/r1sUrnZhg3Y2H7I4QlGUaDSaTqfvaEs6nY5Go4Rn76BwtQsbtLP5kMURdrs9m81qfCnkyGazdvXPAkbhahc2aGfzIZEjMpnMbT2gvYs8Cle7sEE7mw+5HKHNuRYgcstVoc7S1EjhuDE7mw84olZuOcMVjhuzs/mQyxG39EDklkPh6hU2aGfzIZEj0un0pEpGOm3z3vCTtfapPcTkJO1d5GmFizvbOkcIy7Uv3NcqMFyBwiKdc73JExbpbD6M7Yh5jHTaSFexprfcSKdt7l7ra6VaQtPC92v2tVItobkjir52UD0BRxSQyxExAXpbbK5hykKRW071yYZdtnzN3hbW0it74aK+sWGXTcvC9CHH5oZLnrBIZ/MhlyMmyJx12Wyus6SlIrecQNHeFtbSK3/h3hY2N9izLhujzVjQEYQzigNHFJDIEVNTU2NUAu3W5h7iWtq7yNMLB9qtjDFmbQ8Yo3BPc+67dmtzs5VWmlZYaMjCkDubD3M4oqeZkRWh7S0XaM/fZ/e3pC5cRE8zUWxwhKGRyxFBEoNOi8U5SFsbDAZFbjmRquTaWhae351t7qasFHSEQGc6cEQBuRwxSmHAabE4B0hLR0dHR0dFbjnVJ+tuYnNlB5wW1tQte+H7LbubGLEvsTB9yMsBHFFAIkekUqmrBLqaWFMXZWGeVCpFu+Vohbua8n+Wo9bWqzB5zLTCIp3FIXc2H8Z3hE5XAwpXu7BBO5sPuRxxRQ9EbjkUrl5hg3Y2HxI5IplMXtaDZDJJu+VQuKqFDdrZfMARtXLLGa6wQTubD7kccUkPRG45FK5eYYN2Nh8SOSKRSFzUg0QiQbvlULiqhQ3a2XzI4ghFUUKhUCwWu6AtsVgsFArRXkIWhata2KCdzYcsjvB4PF6vNxwOJ7QlHA57vV6P+ldJR+FqFzZoZ/MhiyPi8bjb7VYUxa4tiqK43W4UlrOwQTubDIkcAQCQEDgCAMADjgAA8IAjAAA84AgAAA84AgDAA44AAPCAIwAAPCRyhM/nczgcGv+3jMPh8Pl8KIzCy1LYlMjiiF0ej9/vj0QiWW2JRCJ+v3+X+v+6RWEUrhFkcYSiKNFoNJ1O39GWdDodjUZpT5FCYRSuBWRxhN1uz2azGl8NObLZrJ30VGsURuFaQCJHZDKZ23pAexd5FEbhGkEuR2hzrgWIXMFVqLM0KFxt4Ihi4IhauYJRuHLgiGLkcsQtPRC5glEYhU2PRI5Ip9OT6ulrzb/tVWsfYfnk5CTtXeRVFR7ptLEFNYt3qayvQeHlRafCI5024jVBK2xWDO6IkU6brXNk/pY2F0TlhUc6bex+tb7WnA7ofeGIyuhrpQ4YjpiHXI6IqaW3hbX0LtpUh8gVXMHhh102m2u40t0SFF5+9Cg87LLRLgd6YbMilyMmVHLWZbO5zi7eVoXIFayuYiX7dS9cBXQo3NtCnS69sFmRyBFTU1NjKgm0W63tgcXbqqC9i3ylhcvVCrRb5/06orlHksIL6GkmttSr8NjY2Fig3UprKlTYrMAR+jmCVleHW04UrQv3NFNHK1TYrMjliKBaujezzd2LNtUhcgVXcPhBp8XiHKx0twSF59O9ufj7CCknvIBBp4VWU7SwWZHLEaNqGXBaLM6B+VtqEbmCK+zI7lfrbmKsqVukb9ULLzuaFu5uos5VtLBZkcgRqVTqqnq6mvJf45q6CMuvXr2aSqVoV3DlhU9ss7AFNYt3McYYs2w7IU/h5UXDwl1N5OtAuLBZMbwjxMEth8LLUtisyOWIK3ogcgWjMAqbHokckUwmL+tBMpmkXcEojMK1ABxRK1cwCle7sFmRyxGX9EDkCkZhFDY9EjkikUhc1INEIkG7glEYhWsBWRyhKEooFIrFYhe0JRaLhUIh2iuyojAK1wKyOMLj8Xi93nA4nNCWcDjs9Xo96l8oHYVRuEaQxRHxeNztdiuKYtcWRVHcbjcKo/CyFDYlEjkCACAhcAQAgAccAQDgAUcAAHjAEQAAHnAEAIAHHAEA4AFHAAB4wBEAAB5wBACABxwBAOABRwAAeMARAAAecAQAgAccAQDgAUcAAHjAEQAAHnAEAIAHHAEA4AFHAAB4wBEAAB5wBACABxwBAOABRwAAeMARAAAecAQAgAccAQDgAUcAAHjAEQAAHnAEAIAHHAEA4AFHAAB4wBEAAB5wBACABxwBAOABRwAAeMARAAAecAQAgAccAQDgAUcAAHjAEQAAHnAEAIAHHAEA4AFHAAB4wBEAAB5wBACAx9KOQBAEKQSOQBCEFzgCQRBe4AgEQXj5f9TtP1xHaztlAAAAAElFTkSuQmCC" 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" 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