If there is at least one day on which Grecia and Joe both work at the gallery, then which one of the following could ...

on April 13, 2020

Wouldn’t D work as well?

LLJHK HKGJG

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Ravi on April 13, 2020

@iamalex90,

The problem with your board is that L has to work the second shift on
two consecutive days, but in your hypothetical case, L is working the
first shift on Monday and Tuesday. Thus, it won't work.

If G and J are on the same day, the two possibilities we have are

HKGHG
LLJJK (On Thursday, H and J can switch with each other)

and

GKHHG
JLLJK (on Thursday, H and J can switch with each other)

Does this make sense? Let us know if you have any questions!