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    use Class::Trait 'debug';
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        {a -> m[1], b -> m[2], c -> m[3]} + {a -> m[1], b -> m[3]}
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    { a -> m[1], b -> #, c -> m[3] }
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        { a -> m[1], b -> # } - b
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        { a -> m[1] }
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        { a -> m[1], b -> m[2] } [ c => b ]
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        { a -> m[1], b -> m[2], c -> m[2] }