cas

1- 7,12,14,15,19
          	2- P,3,9,10,14,16,12,22, E
          	3- P,6,10,12,18,22,E
          	4- 3,4,11,15,19
          	5- 1,2,9,20,28
          	6- 8,15,17,24
          	7- P,8,10,15,22
          	8- 6,10,16,23
          	9- 7,9,18,23
          	10- 8,10,13,18
          	11- 7,9,12,19,22
          	12- 12,14,16,19,20,30,33,38
          	13- 6,13,17,21
          	14- 2,9,14
          	15- 6,11,16,24
          	16- 7,8,10,18,21,23
          	17- P,3,4,7,8,10,15,20,24
          	18- P,5,8,10,12,18,26 
          	19- 5,12,26,28
          	20- 5,10,11,19,25,36