]<script>
function FStr(oStr,Num){
for(var i=0 ;i<Math.pow(oStr.length,Num);i++){
var x=i
document.write(i+":")
for(var j=0;j<Num;j++){
document.write(oStr.substr((x%oStr.length),1))
x=parseInt(x/oStr.length)
}
document.write("
")
}
}
FStr("abcdefs",3)
</script>
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