Philip Martin <philip.mar...@wandisco.com> writes:

>    alter(.)
>    alter(A/B)
>    alter(X/Y)
>    rotate(A, X/Y/Z)
>    rotate(X, A/B/C)
>    alter(A)           (pre-rotate X/Y/Z)
>    alter(X/Y/Z)       (pre-rotate A)
>    move(X/Y/Z/B, A/B)
>    alter(X)           (pre-rotate A/B/X)

Oops!                               A/B/C

>    alter(A/B/C)       (pre-rotate X)
>    move(A/B/C/Y, X/Y)

-- 
Philip

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