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a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a

       a
      a a
     a a a
...
  a a a a a a
 a a a a a a a
 a a a a a a a

          The
         same
       principle
...
  basically splitting
 words only on spaces
     or new lines

/[ 
]+/

open F,"ctriangle.txt";sub n{print
" "x(40-$r/2)."$x\n"};for(split/[ 
]+/,join'',<F>){$c=$r,n,$x=''if(
$r=length($x.=" $_"))>$c}n

open F,"ctriangle.txt";sub n{print
" "x(40-$r/2)."$x\n"};$/=$w;$_=<F>;
for(split){$c=$r,n,$x=''if(
$r=length($x.=" $_"))>$c}n