Progressions can be thunderous.Logical formLearned from15 sentences. Age may undergo a progression.Logical formLearned from15 sentences. A book may undergo a progression.Logical formLearned from15 sentences. A natural progression can be for a male.Logical formLearned from15 sentences. A progression can be natural.Logical formLearned from15 sentences. A development may undergo a progression.Logical formLearned from15 sentences. A male may go through progressions.Logical formLearned from15 sentences. A band may undergo a progression.Logical formLearned from15 sentences. (Chord progressions) can be basic.Logical formLearned from15 sentences. A progression may occur.Logical formLearned from15 sentences. Persons may see a progression.Logical formLearned from15 sentences. Progressions can be tonal.Logical formLearned from15 sentences. A problem may undergo a progression.Logical formLearned from15 sentences. A sound may undergo a progression.Logical formLearned from15 sentences. A state can be constituted-of-or-filled-with progression.Logical formLearned from14 sentences.