... that are ranked at either 4 or 5 difficulty. From ... difficulty rating!
4 Star- PT 19, PT 38 ... PT 21 s3, PT 22 s2&4, PT 23 s3, PT 25 ... 39 s2, PT 40 s3, PT 43 s3, PT 44 s4, ... PT 49 s2, PT 51 s3, PT 56 s2, PT 58 ... 59 s2, PT 63 s3, PT 71 s3, PT 76 s2< ...