Mountain Springs Water Company has two departments, Purifying and Bottling. The Bottling Department received $58,000$ liters from the Purifying Department. During the period, the Bottling Department completed $56,000$ liters, including $4,000$ liters of work in process at the beginning of the period. The ending work in process was $6,000$ liters. How many liters were started and completed during the period?

liters started and completed