considering it may not be immediately after consonant

This group is used as a padding between consonant letter and its other diacritics
which may be in arbitrary order

Letter groups A, B, C, E etc. should be redefined in C code
t https://github.com/espeak-ng/espeak-ng/blob/master/docs/dictionary.md#redefinition-of-charater-groups

As Shadda is diacritic mark, it doesn't have meaning as separate letter,
therefore it should be consumed together with diacritized letter.

because then words in ar_list file should be written in replaced form