my $code = <<END_CODE;
writef('["%t", "%t"], ',[X,Y]).
my $tmpfile = "deleteme.pro";
open(TMP,">$tmpfile"); print TMP $code; close(TMP);
my $result = `pl -q -f deleteme.pro -t main`;
[ ["merlyn", "gold"], ["kudra", "gold"], ]
Perl is great at generating code, handing it to an industrial-strength backtracking engine, and scraping the result (though there is also Language::Prolog::Yaswi
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