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Given a binary string , in which direction should we place the parity bits , starting from left to right or right to left? Does both give same result

Ex : Data is 1001

1. P1 P2 1 P4 0 0 1

2. 1 0 0 P4 1 P2 P1

Which is correct?

Ex : Data is 1001

1. P1 P2 1 P4 0 0 1

2. 1 0 0 P4 1 P2 P1

Which is correct?