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function NewBlock(v, x1, x2, y)
//creates the v-th block with coordinates x1, x2, y, y
oid[v] ← -1 //not associated with an object yet
b[v].x1← x1
b[v].x2← x2
b[v].y1← y
b[v].y2← y
b[v].nc← 0
end function