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I got A and B switched around even after trying to read carefully. Maybe naming them "middle" and "destination" would be even clearer?

CPBL
– CPBL

2022-03-09 01:06:21 +00:00
Commented Mar 9, 2022 at 1:06
I agree: done. But you should also tell that to original poster. I just followed the same naming as everybody else (used in OP's question, and also followed in all remaining answers)

abu
– abu

2022-03-10 17:02:42 +00:00
Commented Mar 10, 2022 at 17:02
Oh, right. Done. Thanks.

CPBL
– CPBL

2022-03-10 19:42:47 +00:00
Commented Mar 10, 2022 at 19:42

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