That is apparently the "company line", a diagonal, which makes sense, the odds that a break would ever occur perfectly horizontally or vertically and stay that way without veering off are probably pretty low. What I can't quite figure is how they rule out that a pre-existing condition or stress cannot appear later... but, I suppose it's a rounding error, and in business we expect to round up and the customer to pay the freight otherwise every customer with a break would have a stress crack.
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