Given a grammar ๐บ ๏ปฟbelow:
{๐โ๐ด|๐ต;๐ดโ๐๐ต|๐ด๐|๐;๐ตโ๐๐ด|๐ต๐|๐}
๏ปฟa. ๏ปฟGive the derivative sequence and derivative tree of abbb;
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asked 9 days ago
active 9 days ago