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(To the tune of nursery rhyme "Are You Sleeping, Brother John?". The letters in bold fonts are the words related in topic "sets".  You may use those lyrics using another music. This is an original.)


Are you sleeping, sets are waiting.
Mr. Venn, Mr. Venn?
Elements are distinct, proper or improper
Complement, or do they?

Miss Ellipsis, my infinity,
Your curly brackets, so defined;
How I love to see that universal smile
Lights up the null and empty ones.

Mr. Cardinal, yes, that's who I am!
Head of union from the intersection
I am from the roster of this town's builder/s
Order is my middle name.

(Total words related to sets: 20)