<input onclick=ys() type=button>
<input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt>
<script>
function ys()
{var t=document.getElementsByName("txt"),i=1;
var l=t.length;
var temp=t[0].value
for(i=1;i<l;i++)
t[i].value=temp
}
</script>
<input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt><input name=txt>
<script>
function ys()
{var t=document.getElementsByName("txt"),i=1;
var l=t.length;
var temp=t[0].value
for(i=1;i<l;i++)
t[i].value=temp
}
</script>
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