Thank you to all for answering my question. All of
the answers were helpful. I like the simplicity of this
answer.
2 (-~ 12&|@, -) 9
7 5
And I like the generality of these two answers
below, when the days within the months are a little
different. I am still working on how to choose between the
two possibilities. The second alternative is correct in this
case.
(-~,-)/&.(12 28&#.) 2 5,:9 6 NB. 28 days in Feb
7 1
4 27
(-~,-)/&.(12 30&#.) 2 5,:9 6 NB. 30 days in Sep
7 1
4 29
(B=)
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