1a2b3c4d5e6f7g8h9i10j11k12l13m14n15o16p17q18r19s20t21u22v23w24x25y26z Direct

It looks like you’ve provided a string of consecutive alphanumeric pairs:

1a 2b 3c 4d 5e 6f 7g 8h 9i 10j 11k 12l 13m 14n 15o 16p 17q 18r 19s 20t 21u 22v 23w 24x 25y 26z It looks like you’ve provided a string of

This is essentially a : each number from 1 to 26 is paired with its corresponding letter position in the English alphabet (a=1, b=2, …, z=26). It looks like you’ve provided a string of