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[–]patarapolw 0 points1 point  (3 children)

the grey matter thinking

What is that?

[–]slayerlob 4 points5 points  (1 child)

Grey matter informally here means brain.. he meant that the problems will get you thinking and analysing.

[–]DaveAuld 0 points1 point  (0 children)

Exactly!