Here is a presentation of a frame:

True or false: the following assignment of sets of atomics to points in this frame is a legitimate valuation on the frame.

• 1 : \{p\}
• 2 : \{p, q\}
• 3 : \{p, q, r\}
• 4 : \{p, q, s\}
• 5 : \{p, q, s, t\}