The definition of what a constraint type does … constraint of that type, the error introduced into … [the vertical line constraint] … computes the difference in their x coordinates. … The computed error is a scalar which the … When the one pass method … fails, the Sketchpad system falls back on the … [ref] to reduce the errors indicated by various computation subroutines to … [p. 343] By using Sketchpad's relaxation procedure we were … [able] … [a bridge].
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