Till I was 16, it was just repeating type. I would fumble on K, M, L sounds. It was manageable & nobody knew that I stutter. Then I changed schools, and my stuttering changed to block type. Alphabets don't matter now. I stutter on all kinda words, even my name. I haven't spoken my name without a stutter since 8 years now. Before that, when I was 16, I never ever stuttered on my name. I was fluent 99% of the time. Also, I'm 100% fluent when I'm alone, or singing a song etc.