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var express = require('express');
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        app = express.createServer();
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    app.use(express.bodyParser());
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    app.post('/', function(req, res){
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      var i = req.param('1', null);
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      var j = req.param('2', null);
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      var k = req.param('3', null);
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      var r = i+j+k;
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      res.send(r);
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    });