Language A vs B crib?

[Emma May Smith]

[aiin] is absent at the start of lines, as are almost all words beginning with [a]. My hypothesis is that initial [a] in this position becomes either [da] or another combination.

My best guess as to why--and the overarching theory--is that words are phonetically altered depending on their environment. The start of a line is one such environment, and it makes words beginning with [a] untenable in that position.

There are good reasons to suspect that the truth isn't quite so simple, but I hope that others see it as a valid line of enquiry.