In an earlier contribution to this discussion,
Chris J Dixon wrote:


This is absolutely correct for the particular drop and pattern
repeat the OP mentioned, and clearly worth more widespread
knowledge, but in the general condition, the numbers could just
as easily work out so that this ploy was not necessary.

Yes, I agree. If the height of the wall is N + 1/2 patterns, then - as you
say - you keep using the same roll rather than alternating when the pattern
match is staggered.
--
Cheers,
Roger
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