Once I realized that, I'd combine songs when singing to my little girl:
Bah bah black sheep have you any wool?
H I J L M N O P
Up above the world so high, like a diamond in the sky
Now I know my ABC's
Yes sir yes sir three bags full
It screwed me up through, because when I was learning the other verses to Bah Bah Black Sheep I had trouble memorizing the 7 recipiants of the rainbow sheep's wool, so when I completed it insteald of going to the Bah Bah part I'd sing the ende of Twinkle Twinkle Little Star.