Collisions can be gentle.Logical formLearned from4 sentences. Protection can be against collisions.Logical formLearned from4 sentences. Collisions can be simulated.Logical formLearned from4 sentences. Collisions can be between cyclists.Logical formLearned from4 sentences. Collisions may be considered.Logical formLearned from4 sentences. Collisions can be brutal.Logical formLearned from4 sentences. Collisions can be between (ring particles).Logical formLearned from4 sentences. A nature may pertain-to collisions.Logical formLearned from4 sentences. A head can be on collisions.Logical formLearned from4 sentences. Collisions can be with (hydrogen atoms).Logical formLearned from4 sentences. Spheres may undergo collisions.Logical formLearned from4 sentences. A series can be constituted-of-or-filled-with (midair collisions).Logical formLearned from4 sentences. Collisions can be with polyatomic molecules.Logical formLearned from4 sentences. Atomic nuclei may undergo collisions.Logical formLearned from4 sentences. A role may be played by collisions.Logical formLearned from4 sentences.