Meta operators (V)

• "Naturally," meta operators can be nested
• <a b c> X~ <1 2 3> is a1 a2 a3 b1 b2 b3 c1 c2 c3
• <a b c> RX~ <1 2 3> is 1a 1b 1c 2a 2b 2c 3a 3b 3c
• <a b c> RXR~ <1 2 3> is a1 b1 c1 a2 b2 c2 a3 b3 c3
• That's one of the few useful applications of this I know of :)

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