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We consider phase transitions and potential co-existence of spin-density-wave(SDW) magnetic order and extended s-wave ($s^+$) superconducting order within atwo-band itinerant model of iron pnictides, in which SDW magnetism and $s^+$superconductivity are competing orders. We show that depending on parameters,the transition between these two states is either first order, or involves anintermediate phase in which the two orders co-exist. We demonstrate that suchco-existence is possible when SDW order is incommensurate.

Interplay between magnetism and superconductivity in Fe-pnictides