At the beginning of June, 6,000 diamonds were in process. During June, an additional 9,000 diamonds were started. 7,000 diamonds were completed and transferred to finished goods. As of the beginning of the month, work in process was 80% complete with respect to materials and 60% complete with respect to conversion costs. As of the end of the month, work in process was 50% complete with respect to materials and 30% complete with respect to conversion costs. Calculate the equivalent units of direct labor for June.