Let functions in the block be bilinear functions of u and v.

• N1 = (1 - u) (1 - v)

• N2 = u (1 - v)

• N3 = u v

• N4 = (1 - u) v

• For example:

• N3(1,1) = 1; N3(0,1) = N3(1,0) = N3(0,0)=0

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