Accident
The word "expected" is not the same as "required". Something that is "expected" is something that is assumed will occur. Something that is "required" is something that is essential.
The past tense of the word "occur" is "occurred."
Immediate is a word for occur at any moment.
the arrangements occur. if there are two of the same letter then 12 all different letters then 24 three letters the same then 5 four letters the same then 1
The word: "occur" has two syllables.
"Occur" would work, however, happen is appropriate in most situations.
the same
A prefix occurs before the root word.
occur
happen
Occur
occur