#!perl -l for$n(0..- s//-/+pop){$_.=$"x3**$n.$_}print
#!perl -l s//-/;for$n(0..-1+pop){$_.=$"x3**$n.$_}print
#!perl -l $a='-';$a.=' 'x3**$_.$a for(0..-1+pop);print$a;