a(-1, -1), b(6, 1) ,c(8, 8), d(x, y) are the vertices of a rhombus taken in order

a(-1, -1), b(6, 1) ,c(8, 8), d(x, y) are the vertices of a rhombus tak

1.	a(-1, -1), b(6, 1) ,c(8, 8), d(x, y) are the vertices of a rhombus taken in order
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