<?php
 
// your code goes here
$list = ["あ","い","う","え","お","か","き","く","け","こ","た","ち","つ","て","と","な","に","ぬ","ね","の","は","ひ","ふ","へ","ほ","ま","み","む","め","も","や","ゆ","よ","わ","を","ん","が","ぎ","ぐ","げ","ご","ざ","じ","ず","ぜ","ぞ","だ","ぢ","づ","で","ど","ば","び","ぶ","べ","ぼ","ぱ","ぴ","ぷ","ぺ","ぽ","ぁ","ぃ","ぅ","ぇ","ぉ"];
 
 
$listSize = count($list)-1;
 
for ($i=0;$i<=$listSize;$i++) {
  for ($j=0;$j<=$listSize;$j++) {
    for ($k=0;$k<=$listSize;$k++) {
      for ($l=0;$l<=$listSize;$l++) {
        if (md5($list[$i].$list[$j].$list[$k].$list[$l]) === "e4128b4d066c84056651a3574a3cc2c1") {
          print($list[$i].$list[$j].$list[$k].$list[$l]);
        }
      }
    }
  }
}
 
 

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