Decode the Word: i123llig312a - Simple Letter Substitution

Based on the assumption that the numbers 1, 2, and 3 represent three unknown letters, we can solve the word 'i123llig312a' as follows:

Let's assign the letters as follows: 1 = i 2 = l 3 = g

Replacing the numbers in the word with the corresponding letters, we get the solution: il2llig3ga

Therefore, the word 'i123llig312a' can be solved as 'il2llig3ga'.