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102. Which statements are true about the characteristic of a grid 
system?       

     A.   They are bilateral in nature.
     B.   They are unilateral in nature.
     C.   They are basic in their position.
     D.   Their intersecting locations have no tolerances.
     E.   They are located with respect to board datums.
     F.   They describe diameter of true position.

     Select the three most correct answers

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C, D, & E
Ref IPC-D-275 @ 5.1.2 [pg51]