#!/usr/bin/ruby
# Translation of: https://rosettacode.org/wiki/Amb#Perl
var w = [
    "the|,that|,a|",
    "frog|,elephant|,thing|",
    "walked|,treaded|,grows|",
    "slowly|,quickly|",
];
for (w.map{'{'+_+'}'}->join.glob) { |i|
    i.gsub!('|', ' ') ~~
        /\w+?(\w) \1\w+?(\w) \2\w+?(\w) \3\w+/ && (i.say);
}