ID	weightbefore	weightafter
1	21	26
2	25	26
3	18	21
4	23	26
5	30	29
6	31	31
7	34	34
8	33	30
9	25	26
10	29	32
11	26	29
12	26	28
13	24	29
14	26	28
15	30	31
16	29	29
17	30	27
18	34	33
19	27	32
20	28	32