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- S1=S2, L1=L2 - the 2x1 sides should have equal length and width,
- D1=D2 - the 2x1 diagonals should be equal,
- dS1 = dS2 = 2*dL1 =2*dL2 - tilt angle should provide consistent deviation for all corners,
- dD=0, d(dS)=0, and d(dL)=0 - within precision of measurement.
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