ꭗ I never liked long walks, a- all in summer.
√ I never liked long walks, especially in winter.
a- all (=most importantly): Get plenty of sleep, eat lots of good food, and a- all try to relax.
ꭗ David was a- all the best runner.
√ David was by far the best runner.
ꭗ Where would you like to live a- all?
√ Where would you like to live most of all?
most of all (=of greatest importance; more than any other): I want most of all to be fair. The one I liked the most was too expensive.