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|context> => |context: sw console>

supported-ops |word: *> => |op: plural> + |op: next-plural>
plural |word: *> #=> read-letters (spell |_self> + |letter: s>)
next-plural |word: *> #=> read-letters ("" |_self> + |letter: s>)

supported-ops |word: rat> => |op: >
 |word: rat> => |word: rat>
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