Delete some year lines [solved]

I need help with some New Zealand notes. The year lines are a mess and I need help organizing them.

1. https://en.numista.com/catalogue/note202557.html
The year lines should look like this:
ND 1967-1968 P#163a Fleming
ND 1968-1975 P#163b Wilks
ND 1975-1977 P#163c Knight
ND 1977-1981 P#163d Hardie
ND 1967-1981 P#163s Specimen

2. https://en.numista.com/catalogue/note202549.html
ND 1967-1968 P#164a Fleming
ND 1968-1975 P#164b Wilks
ND 1975-1977 P#164c Knight
ND 1977-1981 P#164d Hardie
ND 1967-1981 P#164s Specimen

3. https://en.numista.com/catalogue/note202550.html
ND 1967-1968 P#165a Fleming
ND 1968-1975 P#165b Wilks
ND 1975-1977 P#165c Knight
ND 1977-1981 P#165d Hardie
ND 1967-1981 P#165s Specimen

4. https://en.numista.com/catalogue/note202496.html
ND 1967-1968 P#166a Fleming
ND 1968-1975 P#166b Wilks
ND 1975-1977 P#16c6 Knight
ND 1977-1981 P#166d Hardie
ND 1967-1981 P#166s Specimen

There is no point in adding prefixes.
Thank you!

I sent some requests to add dates, and the prefix-split lines have been deleted. I did leave the Replacement year-lines though--even if the only difference is the prefix, those are alright to keep separate.