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!7 abstract sclass Proposal { int localScore() { ret 0; } toString { ret "[" + localScore() + "] " + sfu(this); } } static noToString record EnclosedIn(S l, LS contents, S r) extends Proposal { int localScore() { ret checkMapValue(generalMapOfOpeningToClosingBrackets(), l, r); } } static noToString record Infix(LS l, S op, LS r) extends Proposal { } svoid parse(LS tok) { // drop first and last if (l(tok) >= 3) emit(new EnclosedIn(first(tok), dropFirstAndLast_noNewList(tok), last(tok))); for (int i = 1; i < l(tok)-1; i++) emit(new Infix(subList(tok, 0, i), tok.get(i), subList(tok, i+1))); } p-exp { LS tok = javaTokC("[(a|b), (c|d), (e|f)]"); parse(tok); }