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Goal<n>       ::= <. a = 0 .> Item<a, n>;
Item<a, n>(*) ::= <. a = n .>
                | "####" <. a += 4 .> <. a <= n .> Item<a, n>
                | "ooooo" <. a += 5 .> <. a <= n .> Item<a, n>
                | "xxxxxxx" <. a += 7 .> <. a <= n .> Item<a, n>;