3. In parallelograms $A B C D$ and $A E F D$, heights $B P=5$ and $F Q=9$ are drawn to side $A D$. Find the length of the perpendicular from point $C$ to $E F$. If there are multiple possible values, list them in any order separated by a semicolon.
Answer: $4 ; 14 \| 14 ; 4$