modified:   MapReduce_1_3_output_of_map.md
	modified:   MapReduce_1_4_MapOutputBuffer.md
	modified:   MapReduce_2_1_ReduceTask.md
	renamed:    MapReduce_2_2_CopyPhase_and_SortPahse.md -> MapReduce_2_2_CopyPhase.md
	renamed:    MapReduce_2_3_Reducer.md -> MapReduce_2_4_Reducer.md
	modified:   MapReduce_3_1_Merge.md
	modified:   MapReduce_3_2_Combine.md

	MapReduce_2_3_SortPhase.md
	new file:   MapReduce_2_3_SortPhase.md