Обработка div'a циклом в Javascript

$(document).ready(function() { 
 
  function getcities() { 
 
    $citystart = $('.c1_2'); 
    $cityfinish = $('.c2_2'); 
 
    console.log($cityfinish[0].innerHTML); 
    console.log($citystart[0].innerHTML); 
 
  }; 
  var i = 0; 
  while (i < 6) { 
    getcities(); 
    i++; 
  } 
 
 
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> 
<div class="odd  " d-num="1"> 
  <div class="c1_2 blue">Sins</div> 
  <div class="c2_2">Nantes</div> 
</div> 
 
<div class="even  " d-num="2"> 
  <div class="c1_2 blue">Dunningen</div> 
  <div class="c2_2">Kiev</div> 
</div> 
 
<div class="odd  " d-num="3"> 
  <div class="c1_2 blue">Tbilisi</div> 
  <div class="c2_2">Pekin</div> 
</div>