Consider the following relations: Technicians$($SSN$,$ tech$\_$name, address, phone$\_$number$),$ Tests$($FAAid$,$ test$\_$name, max$\_$score$),$ Planes$($Pid$,$ model$),$ and Examine$($SSN$,$ FAAid, Pid, date, score$)$

Find the plane IDs that have examination scores lower than $60\%$ of the max$\_$score of that test, and the corresponding techicians' name and phone nunber who gave that examination.

Write a relational algebric expression.