View source for Total Number of Skill Levels Needed

[[TNoSLN|TNoSLN]] illustrates rough estimate how diverse training is needed to gain access to certain item.
Each prerequisites skill levels are simply added up, by using each skills highest needed value.

'''Example''':
[[Vexor]] needs the folowing skills:
:[[Gallente|Gallente]] Cruiser II
::Spaceship Command III
::[[Gallente|Gallente]] Frigate IV
:::Spaceship Command I
[[Gallente|Gallente]] Cruiser gives +2, Spaceship Command +3, [[Gallente|Gallente]] Frigate +4, but as we have Spaceship Command added in for up to level 3 already the last Spaceship Command is not added up thus resulting to [[TNoSLN|TNoSLN]] 9 to fly [[Vexor|Vexor]].