Warp letterz

X Y WARP Where to find them.
38 48 W In plain sight near the south central border of the map. Reachable only via a Question Mark Switch .
2 36 A In plain sight on an island in the first Quicksand Pit. Reachable only via a Question Mark Switch .
65 1 R In plain sight in a gully in the northeast corner of the map. Reachable only via a Red Warp .
57 28 P In plain sight on a small island in the water. Reachable only via a RW .