A progression can be cruel.Logical formLearned from2 sentences. A progression can be as a martial artist.Logical formLearned from2 sentences. (Chord progressions) may pertain-to a song.Logical formLearned from2 sentences. Expansion can be a natural progression.Logical formLearned from2 sentences. A science may undergo a progression.Logical formLearned from2 sentences. A sound can be a natural progression.Logical formLearned from2 sentences. A testament can be to a progression.Logical formLearned from2 sentences. Some routes can be constituted-of-or-filled-with progression.Logical formLearned from2 sentences. A progression can be in a character.Logical formLearned from2 sentences. A progression can be from events.Logical formLearned from2 sentences. (Lava flows) may undergo progressions.Logical formLearned from2 sentences. A progression can be unresolved.Logical formLearned from2 sentences. A measure of (disability progression) can be (disability status scale).Logical formLearned from2 sentences. Variation can be on a progression.Logical formLearned from2 sentences. A mechanism may pertain-to a progression.Logical formLearned from2 sentences.