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def powers( m ) = map( (^ m), 0.. )
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def
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filtered( s@sh:_, ch:ct ) | sh > ch = filtered( s, ct )
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filtered( sh:st, c@ch:_ ) | sh < ch = sh # filtered( st, c )
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filtered( _:st, c ) = filtered( st, c )
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println( filtered(powers(2), powers(3)).drop(20).take(10) )
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