In Appendix 9, Fig 9A and Fig 9b have arrows pointing to different parts of the diagrams. The arrows are labelled a), b,) c) and d). The NOTES to Figures 9A and 9B are labelled (1), (2), (3) and (4). I believe that this is a typo that crept in Amendment 3 (possibly Amendment 2) of the Seventeenth Edition, probably as a result of the Appendix being inconsistent in it's labeling of the various diagrams.
According to Amendment 1 of the Seventeenth - Note (1) corresponds to arrow a), Note (2) corresponds to arrow b), etc.
Apologies if this is not the correct use of the forum but I am not sure where else to post this so that it get picked up for the next amendment.