'Wet Footprints' Volume 20 explains the sidewalk wet puddle prints go away in the sun. Sentence Story in a Story 'Wet Footprints' PreReader Product Volume 20 was designed as an assisted learning aide in word recognition and beginning comprehension through visual representation-to understand and to be able to read a complete sentence with comprehension. In this Pre-Reader the sentence comprehension is also to put together several sentences that read to the reader a story-sentence story with a complete story combining all sentences to give the reader additional information for a bigger story.