new_period (second = 90, minute = 5)
# "5M 90S"
new_period(day = -1)
# "-1d 0H 0M 0S"
new_period(second = 3, minute = 1, hour = 2, day = 13, week = 1)
# "20d 2H 1M 3S"
new_period(hour = 1, minute = -60)
# "1H -60M 0S"
new_period(second = 0)
# "0S"
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