Military expansion. The Rashidun Caliphate expanded gradually; within the span of 24 years of conquest, a vast territory was conquered comprising Mesopotamia, the Levant, parts of Anatolia, and most of the Sasanian Empire. Unlike the Sasanian Persians, the Byzantines, after losing Syria, retreated back to Anatolia.
1 And the nature of this reality again can neither be consistently represented as a fixed and hard substance nor as an unalterable something, but only as a fixed order of recurrence of continually changing events or impressions.
Concurrent Sentence Definition. Consecutive means one after another, concurrent means at the same time, so for the numbers you have given, the total would be 100, because the first 90 of the concurrent would tick off at the same time the 90 consecutive would, thus leaving a balance of 10. This Site Might Help You.