If we don't have to be strict compliant...49. 
sub c {
@r='';@r=map{$c=$_;map$c.$_,@r}@_ for 1..shift;@r
}

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(Note: I handle the case of $n=0 correctly. The solution that you started with does not...)

In reply to Re (tilly) 1: (Golf) Ordered Combinations by tilly
in thread (Golf) Ordered Combinations by MeowChow

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