However, the PPTs in this group do not characterize the understanding of pattern generalization of the student who is able to carry out far generalization but not the inverse process (student B). One future teacher in this group noticed the mistake made by this student in problem 3: “he/she counts the number of children twice to find out the tables and adds 2 to that, as if looking in fact for the number of chairs” (response to question 1). And the PPT says that “the generalization process in problem 1 and 2 is fine, but in 3 he/she encounters an obstacle”. But this future teacher was not able to interpret this obstacle and did not specify the reason the student “got caught up with the chairs, the tables, the addition and subtraction.”