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Trailing-Edge - PDP-10 Archives - BB-H311C-RM - swskit-hacks/qkinvr.tec
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z-1u1 0u2
z/2< q2j 0au4 q1j 0au5 q4f q2j q5f :%1 %2> j

!* quickly inverts, character by character, the contents of the buffer *!