Notes, sequences and other types of events can be repeated any number of times, by simply appending * and a number. Putting whitespace between the event and the * is optional, as is putting whitespace between the * and the number of repeats.
For example:
piano:
# repeating single notes
c *4 c2 *2
# repeating a sequence containing notes and an octave change
[c8 d e >]*3