Taking first letter of each group one by one, the number of letters between them as per the english alphabetical order is
Taking second letter of each group, it would be 1 7, 13, 19 and so on. Hence S+1 = T, T+7 = A, A+13 = N and N+19 = G.
The letters of the word 'STANG' is written one by one for each group.
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