Level 4

Place \ Cars	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1st	0	2	3	4	7	8	10	12	14	17	20	21	22	23	24	25	26	28	29	31
2nd		1	1	2	3	4	7	8	12	13	14	15	17	20	22	22	22	22	22	22
3rd			1	1	1	2	3	4	10	11	12	13	14	15	19	19	19	19	19	19
4th				1	1	1	2	3	8	9	10	11	12	13	14	14	14	14	14	15
5th					1	1	1	2	2	4	7	8	9	10	11	12	12	12	13	14
6th						1	1	1	1	2	3	4	7	8	8	10	10	11	12	13
7th							1	1	1	1	2	2	2	3	4	8	8	9	10	10
8th								1	1	1	1	2	2	2	3	4	4	7	8	9
9th									1	1	1	1	2	2	2	2	3	4	4	7
10th										1	1	1	1	2	2	2	2	3	4	4
11th											1	1	1	1	2	2	2	3	3	3
12th												1	1	1	1	2	2	2	3	3
13th													1	1	1	1	2	2	2	3
14th														1	1	1	1	2	2	2
15th															1	1	1	1	2	2
16th																1	1	1	1	2
17th																	1	1	1	1
18th																		1	1	1
19th																			1	1
20th																				1