it work like this :
55 -5 -5 = 45
56 -5 -6 = 45
57 -5 -7 = 45
now guesse what 58 will be like.
same counts for 65
65 -6 -5 = 54
etc.
watch the letters. in 9, 18, 27, 36, 45, 54, 63, 72, 81 and 90 they're the same letter.
doesn't matter what numer you pick always end up getting 1 out of these 10 answers.
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