48 x
1 a
1 b
1 c
3 +
2 a
9 +
3 a
3 ÷
4 a
14 +
5 a
3 ÷
6 a
30 x
7 a
2 b
3 b
4 b
5 b
6 b
7 b
7 c
2 -
8 a
8 b
5 c
10 +
9 a
15 x
10 a
10 b
3 ÷
11 a
11 b
5 d
9 b
10 c
2 -
12 a
2 -
13 a
3 -
14 a
12 +
15 a
15 b
15 c
12 b
13 b
14 b