* group 0
students: 7 8 1
shared interests between 1 and 2: 0
shared interests between 1 and 3: 1
shared interests between 2 and 3: 1
total= 2
* group 1
students: 12 5 11
shared interests between 1 and 2: 0
shared interests between 1 and 3: 0
shared interests between 2 and 3: 1
total= 1
* group 2
students: 3 4 14
shared interests between 1 and 2: 1
shared interests between 1 and 3: 1
shared interests between 2 and 3: 0
total= 2
* group 3
students: 0 6 9
shared interests between 1 and 2: 1
shared interests between 1 and 3: 1
shared interests between 2 and 3: 1
total= 3
* group 4
students: 13 2 10
shared interests between 1 and 2: 0
shared interests between 1 and 3: 1
shared interests between 2 and 3: 0
total= 1
* total in all groups= 9