Proposition A: Let horizontal lines represent categories or subjects or relationships that are in weak opposition to each other, that is, do not cancel each other out. They can co-exist.
Proposition B: Let vertical lines represent categories or subjects or relationships that are in some way complementary to each other; they tend to confirm or imply each other.
Proposition C: Let diagonal lines
represent categories or subjects or relationships that are in strong opposition,
or contradictory to one another; the presence of one cancels out the presence
of the other. Neither can exist in the same space at the same time.
Prescribed:
-----------------------------------------------------------------------Forbidden:
even legally mandated
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