Apple Final Cut Pro 7 - Manual (Page 1933)

In the illustration below, film frames A, B, and D are mapped to video frames 1, 2, and 5.
However, because film frame C is split into two fields across video frames 3 and 4,
pull-down removal requires deinterlacing, which is more processor-intensive than removal
of pull-down patterns such as advanced (2:3:3:2) pull-down. Pull-down removal typically
requires manual identification of the A frame in the pattern, which you can identify visually
by moving frame by frame through your footage until you recognize the pull-down
pattern.
1933 Appendix D Working with 24p Video