5.3.1.16 Construction of secrets

условие: На ребрах \( A A_{1}, B B_{1}, A C, B_{1} C_{1} \) и \( A_{1} C_{1} \) призмы \( A B C A_{1} B_{1} C_{1} \) заданы соответственно точки \( P, Q, R, U, V \). Build a line of intersection of planes \ (p Q C \) and \ (b r v \).