11
Person1
NOT PRESENT
Person2
PRESENT
Person4
NOT PRESENT
Person5
NOT PRESENT
Person7
PRESENT
Person10
NOT PRESENT
Person12
NOT PRESENT
Person13
NOT PRESENT
Person17
NOT PRESENT
Person18
PRESENT
Person20
PRESENT
10
Person0:Person1,Person2
Person3:Person4,Person5
Person6:Person4,Person7
Person8:Person6,Person4
Person9:Person10,Person2
Person11:Person12,Person13
Person14:Person2,Person10
Person15:Person0,Person10
Person16:Person17,Person18
Person19:Person13,Person20