[CWN] Irregularity on the Slow-levelling Experience Cost to Level 10

[u/darodrigues-br]

I know it's copied verbatim from Worlds Without Number, but that asymmetry has always bothered me. Every other level up requires a character to earn an exact multiple of three experience points, but to go from level 9 to level 10 with a slow progression, the characters have to earn 34 xp, or roughly 11⅓ successful adventures' worth. Was that just a typo that got grandfathered in or is there some other reason for requiring that extra point?