A song may undergo a progression.Logical formLearned from8 sentences. Persons may undergo a progression.Logical formLearned from8 sentences. Progression can be through a program.Logical formLearned from8 sentences. Structural failures may undergo a progression.Logical formLearned from8 sentences. A progression may pertain-to humanity.Logical formLearned from8 sentences. Lessons may undergo a progression.Logical formLearned from8 sentences. A (chord progression) can be repeated.Logical formLearned from8 sentences. A means can be constituted-of-or-filled-with progression.Logical formLearned from8 sentences. A person may have a progression.Logical formLearned from8 sentences. A progression can be toward malignancy.Logical formLearned from8 sentences. Places can be in a progression.Logical formLearned from8 sentences. A progression can be presidential.Logical formLearned from8 sentences. A theory of progression may hold that something-is-the-case.Logical formLearned from8 sentences. A step may pertain-to a progression.Logical formLearned from8 sentences. (Ovarian cancer) may undergo a progression.Logical formLearned from8 sentences.