A, E, F, H, I, ?

L, M, N, O, R, S, U, X. Letters whose English names start with vowels.

PHP Warning

lib/DbaDatabase.php:154: Warning: dba_optimize() [<a href='function.dba-optimize'>function.dba-optimize</a>]: You cannot perform a modification to a database without proper access

lib/DbaDatabase.php:134: Warning: dba_replace() [<a href='function.dba-replace'>function.dba-replace</a>]: You cannot perform a modification to a database without proper access