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<html>
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 <style type='text/css'>

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            body {

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                font-family: "Chalkduster";

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            }

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            h1, h2, h3, h4, h5, h6 {

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              display: inline;

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              margin: 0;

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              font-weight: normal;

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            }

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            input

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{

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	font-family: "Chalkduster";

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	font-size:0.95em;

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}

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        </style>

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<script type="text/javascript">

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<!--

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/* This script and many more are available free online at

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The JavaScript Source!! http://www.javascriptsource.com

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Created by: Matthew Roy :: http://matthewroy.com */

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/*****************************************

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**   Matthew C. Roy

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**   Big Business Websites

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**   For Small Business Prices!

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**   http://www.matthewroy.com

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**

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**   You may use this script freely for

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**   non-commercial use as long

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**   as this header is left intact.

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*****************************************/

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var n1, n2, d1, d2, An, Ad, Op;

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var int 

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var neg=1;

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function solve(){

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  //If all fields are numbers

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  if(!isNaN(document.calc.n1.value)&&!isNaN(document.calc.d1.value)&&!isNaN(document.calc.n2.value)&&!isNaN(document.calc.d2.value)){

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  //If no fields are blank

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  if(document.calc.n1.value!=''&&document.calc.d1.value!=''&&document.calc.n2.value!=''&&document.calc.d2.value!=''){

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    //Set variables:

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    n1=document.calc.n1.value;// Numerator 1

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    d1=document.calc.d1.value;// Numerator 2

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    n2=document.calc.n2.value;// Denominator 1

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    d2=document.calc.d2.value;// Denominator 2

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    Op=document.calc.Op.value;// Operator

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    } else {

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    //If blank field

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    alert('Please fill-in all fields!');

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    }

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  } else {

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  //If field has non-number

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  alert('Please enter only Numbers into the fields!');

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  }

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  //Which Operation

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  switch (Op){

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  case '+':

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    //add fractions using formula ((n1*d2)+(n2*d1)) over (d1*d2)

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    if (d1==d2){

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      Ad=d1; //Answer Denominator

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      An=parseInt(n1)+parseInt(n2); //Answer Numerator

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    }

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    else{

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      if (Math.max(d1,d2) % Math.min(d1,d2) == 0){

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        Ad=Math.max(d1,d2) //Answer Denominator

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        An=parseInt(Ad/d1*n1) + parseInt(Ad/d2*n2) //Answer Numerator

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      }

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      else{

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        Ad=(d1*d2) //Answer Denominator

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        An=parseInt(n1*d2)+parseInt(n2*d1) //Answer Numerator

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      }

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    }

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    if(document.calc.reduce.checked==1){

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      reduce();

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    } else {

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      display();

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    }

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   break

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  case '-':

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    //subtract fractions using formula ((n1*d2)-(n2*d1)) over (d1*d2)

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    if (d1==d2){

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      Ad=d1; //Answer Denominator

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      An=(n1-n2); //Answer Numerator

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    }

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    else{

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      if (Math.max(d1,d2) % Math.min(d1,d2) == 0){

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        Ad=Math.max(d1,d2) //Answer Denominator

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        An=Ad/d1*n1 - Ad/d2*n2 //Answer Numerator

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      }

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      else{

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        Ad=(d1*d2) //Answer Denominator

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        An=(n1*d2)-(n2*d1) //Answer Numerator

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      }

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    }

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    if(document.calc.reduce.checked==1){

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      reduce();

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    } else {

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      display();

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    }

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   break

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  case '*':

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    //multiply fractions using formula (n1*n2) over (d1*d2)

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    An=n1*n2;//Answer Numerator

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    Ad=d1*d2; //Answer Denominator

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    if(document.calc.reduce.checked==1){

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            reduce();

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    } else {

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      display();

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    }

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    break

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  case '/':

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    //divide fractions using formula (n1*d2) over (d1*n2)

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    An=n1*d2;//Answer Numerator

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    Ad=d1*n2;//Answer Denominator

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    if(document.calc.reduce.checked==1){

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      reduce();

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    } else {

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      display();

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    }

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   break

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  }

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}

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function reduce() {

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  neg=1; //1 if positive, -1 if negative

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  //convert to strings

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  ng=An+'';

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  dg=Ad+''

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  if(ng.indexOf('-')!=-1){  //check to see if answer is negative.

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    neg=-1

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  }

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  if(dg.indexOf('-')!=-1){

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    neg=-1

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  }

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  if(ng.indexOf('-')!=-1&&dg.indexOf('-')!=-1)  {//if both numerator and denominator are negative the answer is positive

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    neg=1

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  }

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  var factorX //highest common factor

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  if ( An == 0 || Ad == 0 ) {

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    factorX=1;

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    return;

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  }

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  An = Math.abs( An );

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  Ad = Math.abs( Ad );

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  var factorX = 1;

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  //Find common factors of Numerator and Denominator

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  for ( var x = 2; x <= Math.min( An, Ad ); x ++ ) {

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    var check1 = An / x;

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    if ( check1 == Math.round( check1 ) ) {

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      var check2 = Ad / x;

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      if ( check2 == Math.round( check2 ) ) {

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        factorX = x;

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      }

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    }

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  }

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  An=(An/factorX)*neg;  //divide by highest common factor to reduce fraction then multiply by neg to make positive or negative

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  Ad=Ad/factorX;  //divide by highest common factor to reduce fraction

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  display();

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}

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function display(){

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  //Display answer

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  document.calc.An.value = An;

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  document.calc.Ad.value = Ad;

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}

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// -->

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</script>

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</HEAD>

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<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

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<BODY>

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<table width="250" align="center" border="0" cellspacing="0" cellpadding="1" style="background-color:#ffffff;border:1px #000000 solid;">

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  <tr>

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    <td align="center" valign="middle">

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      <h3>Calculadora de Quebrados</h4>

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      <form name="calc">

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        <table width="150" border="0" cellspacing="0" cellpadding="5">

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          <tr>

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            <td style="border-bottom:4px #000000 solid;"><input type="text" size="1"  name="n1" id="n1" tabindex="1"></td>

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            <td rowspan="2" align="center" valign="middle">

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              <select name="Op" tabindex="3">

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              <option value="+">+</option>

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              <option value="-">-</option>

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              <option value="*">x</option>

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              <option value="/">รท</option>

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              </select>

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            </td>

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            <td style="border-bottom:4px #000000 solid;"><input type="text" size="1" name="n2" id="n2" tabindex="4"></td>

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            <td rowspan="2" align="center" valign="middle"><input type="button" value=" = "onClick="solve();" tabindex="6"></td>

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            <td style="border-bottom:4px #000000 solid;"><input type="text" size="1" name="An" id="An" readonly="1"></td>

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          </tr>

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          <tr>

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            <td><input type="text" size="1" name="d1" id="d1" tabindex="2"></td>

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            <td><input type="text" size="1" name="d2" id="d2" tabindex="5"></td>

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            <td><input type="text" size="1" name="Ad" id="Ad" readonly="1"></td>

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        </tr>

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        </table>

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      <br><input type="checkbox" name="reduce" id="reduce" checked> Reducir

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    </form>

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    </td>

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  </tr>

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</table>
        

    


            


                                


        

            



                
    

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