#!perl $,='-';$,.=' 'x3**$_.$,for(0..-1+pop);print"$, "
#!perl $,.=$_?' 'x3**($_-1).$,:'-'for(0..pop);print"$, "
#!perl -l push@/,' 'x3**$_.'-',@/for(0..-1+pop);print'-',@/
#!perl $n=pop;$;='-';$;.=' 'x3**$_.$;for(0..--$n);print"$; "