To the gym dudes, how many kind of exercises do for each body parts?

I've seen a friend's plan. he has like 6/7 exercises for chest and shoulder. 3/4 sets for each exercises. and 4 exercises for biceps and triceps. i dont really get it through? why are there like double more exercises for the chest and shoulder? any good advice?
To the gym dudes, how many kind of exercises do for each body parts?
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