Hm ... is this a trick question?
I have muliples because I am curious what I can get with different lenses.
Here are interchangeable lenses that I use on RF cameras:
[very] wide angle: 19mm Canon, 21mm Rokkor, CV 25mm
wide angle: 28mm Rokkor, 28mm Kobalux
[somewhat] wide angle: 35mm Summicron [goggled], 35mm Summicron [M2 version],
35mm Canon, 35mm Rokkor
[somewhat] normal: 40mm Summicron, 43mm Pentax-L
normal [somewhat longer?]: 50mm Elmar 2.8, Elmar 3.5, Heliar Classic 3.5, Heliar Classic 2.0, Summar, Summitar, Summarit, Summicron collapsible, Summicron rigid, Carl Zeiss Jena 1.5, CZJ 2.0, Tessar 2.8, J-8, J-3, plus many FSU duplicate lenses.
[short] tele:75mm Summilux, 85mm 1.5 Canon, 85mm Steinheil, J-9, 90mm Elmar, 90mm Elmarit, 90mm Summicron, 105mm Nikkor.
tele: 135mm Hektor, Nikkor, CZJ Sonnar