An inside edge may pertain-to (spiral arms).Logical formLearned from3 sentences. A spiral can be constituted-of-or-filled-with insanity.Logical formLearned from3 sentences. A (spiral feature) can be rare.Logical formLearned from3 sentences. A (spiral feature) can be constituted-of-or-filled-with mid-ocean ridges.Logical formLearned from3 sentences. A spiral can be rectilinear.Logical formLearned from3 sentences. A methodology may be knowned as (spiral development).Logical formLearned from3 sentences. Spirals can be downward.Logical formLearned from3 sentences. Spiral may undergo a population.Logical formLearned from3 sentences. A program may undergo (spiral development).Logical formLearned from3 sentences. A (spiral galaxy) can be pinwheel-shaped.Logical formLearned from3 sentences. A spiral can be periodic.Logical formLearned from3 sentences. (Spiral galaxies) may undergo mergings.Logical formLearned from3 sentences. Arms may pertain-to a spiral.Logical formLearned from3 sentences. Persons may start a spiral.Logical formLearned from3 sentences. A mass can be on a (spiral spring).Logical formLearned from3 sentences.