For example, 50Xab1M5.
50: the 50 person filled out the questionaire.
X: The questionaire is numer X.
ab: He choose a and b as his answer.
1: He put the questionaire back to box 1.
M: He is a male.
5: And he has 5 surroing people.
For example, 21Jk2F1
21: the 21st person fil