Simplify and correct output of P13-topo.pl
Simplify and correct output of P13-topo.pl

Previous to this commit the code was printing spurious Boolean output in
between the expected array elements.  This wasn't what was expected
according to the specifications

Quinny/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples