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MS851B User’s Manual
Linear Security Level 2
All code types must be successfully read twice before being decoded.
Linear Security Level 3
Code types other than the following must be successfully read twice before
being decoded. The following codes must be read three times:
Code Type
Length
MSI
4 or less
D 2 of 5
8 or less
I 2 of 5
8 or less
Linear Security Level 4
All code types must be successfully read three times before being decoded.