English grammar rule Phrase repetition

Usually, repeated words or phrases are typos. However, occasionally a word or phrase can still be repeated in a sentence. The most common is had had when using to have in the past perfect tense. (If he had had water instead of coffee . . .)

Examples of 'Phrase repetition' rule

Incorrect	Jimmy had to make a a doctor’s appointment.
Correct	Jimmy had to make a doctor’s appointment.
Incorrect	Michael said he would he would get here soon.
Correct	Michael said he would get here soon.
Incorrect	Christel chose to to skip the dance.
Correct	Christel chose to skip the dance.