#!perl -l @0='-';push@0,($")x@0,@0for 1..pop;print@0
#!perl -l $l='-';map$l.=$"x(3**$_/3).$l,1..pop;print$l
#!perl -l $l='-';map$l.=$"x 3**($_-1).$l,1..pop;print$l
#!perl -l $_='-';for$n(1..pop){$_.=' 'x length().$_}print;