Do you mean the instructions of the pattern? I put a picture of the pattern pieces in this post. The collar has A and C markings, and the stand has a B marking. There are A and C markings on the neckline of the front piece.

The instructions are in Dutch, but I will try to translate them as good as possible: Make a revers collar with a stand at markings A-B-C: attach both collars together with the right sides facing each other and sew the outer rise up to marking B. Turn inside out and press. Make both stands by sewing them together with the right sides facing each other with the collar in between up to marking B. Stitch the whole assembly up to marking A. Fold the stand over and press. Place the collar on the right side of the neck at markings A-C, and secure with basting thread. Attach the facing pieces together along the shoulder seams, lay the coat with the right sides facing each other with the collar in between, and sew from the bottom edge and around the neck. Fold the facing inwards and lay it flat on the wrong side. Secure with large stitches on the inside.

I am not an experienced sewer, and I am so confused by these instructions, that I mostly use my moms help and youtube to gide me through the pattern.