simple subtraction

7:30

10:43

5:01

7:03

11:08

13:21

4:14

4:07

3:38

8:07

8:32

2:26

11:19

7:06

10:26

4:25

12:17

11:08

5:28

21:42

23:18

7:27

4:17

59:22

4:33

1:14

6:51

3:04

7:08

4:19

14:17

2:15

2:14

6:32

6:12

4:06

37:42

4:23

3:59

11:15

24:53

7:06

1:39

20:03

4:54

11:24

17:53

3:33

1:44

11:21

6:40

3:24

1:37

2:47

11:16

1:03

9:35

4:06

3:11

5:59