unit 1—2 1
unit 3 6
unit 4 8
unit 5 11
unit 6 13
unit 7 15
unit 8 18
unit 9 23
unit 10 25
unit 11 28
unit 12 31
unit 13 34
unit 14 37
unit 15 40
unit 16 43
unit 17 45
unit 18 49
unit 19 54
unit 20 58
unit 21 61
unit 22 65
unit 23 70
unit 24 73
unit 25 76
unit 26 81
unit 27 85
unit 28 88
unit 29 92
unit 30 96