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First, locate the first letter n grid 2 and the second letter in grid 1. If the two letters are on the same line, switch them, (in the vertical version, apply with columns rather than lines)
Else, find the 2 original letters by locating the two letters that completes the imaginary rectangle (see encryption). As for the encryption process, start with the letter on the same line of the first letter of the bigram, so grid 1.
Example: C (grid 2) and D (grid 1) are on the same line, switch them: DC
Example: L (grid 2, line 3, column 4) and B (grid 1, line 1, column 5) are not on the same line, opposite corners are O (grid 1, line 3, column 5) and D (grid 2, line 1, column 4)
Example: A (grid 2, line 1, column 5) and V (grid 1, line 5, column 2) are not on the same line, opposite corners are E (grid 1, line 1, column 2) and Z (grid 2, line 5, column 5)
