a(c+d)+b(c+d)
=(a+b)(c+d)
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(a + b)(b + c)
A+BC+AC+B=A+BC+AC+B unless any of these variables has an assigned value.
never A+ :))
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No, four lines can can have 6 total intersections. They would be Ab, Ac, Ad, Bc, Bd, and Cd