An excavation can be periodic.Logical formLearned from2 sentences. (Security drills) can be periodic.Logical formLearned from2 sentences. Sloughings can be periodic.Logical formLearned from2 sentences. A deposition can be periodic.Logical formLearned from2 sentences. An (unit training) can be periodic.Logical formLearned from2 sentences. (Scandium columns) may pertain-to a periodic table.Logical formLearned from2 sentences. A graph can be periodic.Logical formLearned from2 sentences. Resetting can be periodic.Logical formLearned from2 sentences. Interjections can be periodic.Logical formLearned from2 sentences. A repeal can be periodic.Logical formLearned from2 sentences. Periodic waves can be constituted-of-or-filled-with emigration.Logical formLearned from2 sentences. (Conjugacy classes) can be periodic.Logical formLearned from2 sentences. Trysts can be periodic.Logical formLearned from2 sentences. A timetable can be periodic.Logical formLearned from2 sentences. (Group vs) may pertain-to a periodic table.Logical formLearned from2 sentences.