Can we move 2015 to its own page and delete 2021?

I only noticed now, but the 2015 note is nothing like the 2018, 2020 and 2022.

Here's the 2015:

Has a fat holographic stripe and one set of tactile marks on the right, but not on the edge

Here's 2018, 2020 and 2022:

Now it has a windowed security strip and two sets of tactile marks, at the edge.

I haven't got a 2015 to check the UV activity, it will probably be different.

The 2015 looks more like the 2014, all that note doesn't have is the tactile marks.

Also, I can't find a 2021 note anywhere, but it is a line in the catalog. Has anyone seen one of these or should 2021 be deleted?

I think you're right @odd job  the 2015 series is also printed by Giesecke & Devrient, Germany (it has the imprint on the back right lower border) the same as P-51. P-58 is mostly printed by TDLR.  While  P-51 was printed by G&D, the 2015 series has marks for the blind only on the right side (& most of P-51 has no marks).  It seems to be one of those “borderline” notes, like we saw in the Philippines (notes with marks for the blind & versions without).  It would be more fitting to label it a version of P-51 (or P-51d or P-51A*) IMO since the printer/security strip are the same as P-51 (not P-58).  

*P-51A is the convention they used for a completely different version of a note (& since it has only one set of marks for the blind -it could be labelled thus). 

Good eye for picking that out! 

One thing I still haven't found is a 2021 note. Has anyone seen one?