D-2

v-1.1
---
1. Get: adaptability
2. Get: pairs

	==> done
D-2

v-1.2.0
---
1. get_Pairs_v4 	(Gene[] genes, int num_of_pairs)
2. get_PairIds_v2(Gene[] genes, int num_of_pairs)

	==> done
D-2

v-1.2.1
---
1. use List<HashSet>

	==> done
D-2

v-1.3
---
1. build => Pair[] from pair_ids

	==> done
Merge branch 'D-2_initial-coding_Kodaka.208'