In this Recent Question, what was the encryption mapping?
In other words, how did each letter map to its 2-digit counterpart?
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The encryption mapping was done by:
dividing the alphabet into 4 groups of letters based on the number of strokes that could be used to hand-print each letter (from 1 to 4 strokes). The letters in each group are in alphabetical order.
If this is the correct answer, it should be noted that there is no standard method of hand-printing the English alphabet, although this wikiHow does describe the use of a similar number of strokes. There are many guidelines for using other methods.