Years can be a mystery.Logical formLearned from14 sentences. A source may remain a mystery.Logical formLearned from14 sentences. An identity of hijackers may remain a mystery.Logical formLearned from14 sentences. A mystery can be stubborn.Logical formLearned from14 sentences. A (murder mystery) can be fictional.Logical formLearned from14 sentences. A twist can be to a mystery.Logical formLearned from14 sentences. A mystery can be quirky.Logical formLearned from14 sentences. A time may undergo (murder mysteries).Logical formLearned from14 sentences. Upper echelons may contemplate a mystery of ablatives.Logical formLearned from14 sentences. A mystery can be disturbing.Logical formLearned from14 sentences. An object can be constituted-of-or-filled-with mystery.Logical formLearned from14 sentences. A mystery can be theological.Logical formLearned from14 sentences. A mystery may pertain-to a house.Logical formLearned from14 sentences. A (mystery series) may undergo an installment.Logical formLearned from14 sentences. Mysteries may pertain-to an atom.Logical formLearned from14 sentences.