This is a spin-off and heavily inspired by Levieux's puzzle that I enjoyed helping answer/solve. And I've never used ciphers or things like this before so I wanted to learn some new puzzles :)
I have an alphabetically sorted collection of singles in my library. Unfortunately somebody shifted things around a bit and then deleted some stuff in all of the resulting pairs. Only the 26th pair is a correct match, although that's been scrambled even more and has become completely unrecognizable now. Can you figure out what it used to be? The numbers might help you.
Here are the 25 shifted pairs:
{2,N/A} $\implies$ D - BBYERETIE
{1,N/A} $\implies$ RTYSPRS - LLJ
{6,N/A} $\implies$ IJCS - R
{6,5} $\implies$ CLTRCLB - HYJD
{8,N/A} $\implies$ HBS - IGOFING
{5,N/A} $\implies$ THBCKYSPS - OFM
{5,N/A} $\implies$ JL - CATTYUUTFMYA
{10,7} $\implies$ KYMNOGU - CARSSWHSPR
{4,N/A} $\implies$ GEORGEMCHEL - SUKYK
{1,8} $\implies$ KYK - JGIVEEREN
{7,8} $\implies$ PI&SS - -BMYH
{4,10} $\implies$ TNBRXTN - WILLLWYSLVEYU
{11,N/A} $\implies$ IUS - ,PRMA
{10,N/A} $\implies$ BS - U'ETHEETHATWAT
{7,N/A} $\implies$ JHNV&IVINJHN -
{3,7} $\implies$ ABBA - HIPSDON'TLIE
{1,N/A} $\implies$ SHKIR - QUNDOQUNDOQUNDO
{1,2} $\implies$ ONYNIS - AHB
{15,N/A} $\implies$ CL - OHROSHUS
{5,N/A} $\implies$ QEE - RIGHTROD
{8,1} $\implies$ FLORID - MSSCHUSETTS
{3,N/A} $\implies$ BG - LOVTORY
{9,N/A} $\implies$ YOI - HEEE
{3,2} $\implies$ ROGRWHITTKR - SXYBCK
{9,N/A} $\implies$ JUSTNTMB - PY
And the 26th is:
{4,N/A} $\implies$ BNL DIFF SOZ OPF - BZTWQ
Apologies that some are really hard and some are obvious
