A period can be from a commencement.Logical formLearned from1 sentences. A historical era may undergo a commencement.Logical formLearned from1 sentences. A US-city may lead to a commencement of a rebellion.Logical formLearned from1 sentences. An egg-cell can be at a commencement of embryonic development.Logical formLearned from1 sentences. Embryonic development may undergo a commencement.Logical formLearned from1 sentences. (Building operations) may undergo a commencement.Logical formLearned from1 sentences. Matches may undergo a commencement.Logical formLearned from1 sentences. Memoirs of a reign of a king may undergo a commencement.Logical formLearned from1 sentences. Executions may undergo a commencement.Logical formLearned from1 sentences. A danger may undergo a commencement.Logical formLearned from1 sentences. Sporulation may undergo a commencement.Logical formLearned from1 sentences. An end of cleavage may be marked by a commencement of a differentiation of organs.Logical formLearned from1 sentences. A reign may mark a commencement of an era of prosperity.Logical formLearned from1 sentences. Signs may face to a commencement of a line.Logical formLearned from1 sentences. Seconds can be before a commencement of a phase.Logical formLearned from1 sentences.