Hi Turbo,
In answer to your questions:
Column L refers to unit discounts and is applicable to a whole faction as opposed to a region.
Column K refers to bonuses for units in specific regions and these provide a +1 valour to the unit if built in the region.
ALL regions specified in column K WILL impose the +1 bonus to the unit, even if one unit has more than one region. However, the other regions specified for any one unit will, however, not be shown on the strategy map (only the first is written on the parchment). The AI will follow the path to producing the unit in only the first stated province. All others will follow normal building patterns, but still imply the +1 bonus if the unit is built there.
If a region has bonuses to more than one unit type only one path to producing one unit is followed (i think it's the one furthest down in the list, but don't quote me...?!, however, ALL units will receive the bonus. In contrast i think the highest up on the list will be actually be written in the parchment?
Beware, the AI can run into major problems developing provinces with unit bonuses.
In VI, bare starting provinces (no initial improvements), get totally stuck and the AI doesn;t develop the province. Probably due to one to many castle upgrades in the way? The only provinces that appear to benefit in VI are the ones that have good starting improvements in place. This include West Seaxe, Mierce and Dal Riada.
In MTW the AI copes better with the land bonuses, but will specialise in developing the buildings necesaary to produce that unit, often at the expense of other essential buildings. Take the Italians not building a merchant in Venice, because they are focusing on Galleys, as a prime example. Egyptians not building up Egypt, because of the Mamluk cav bonus is another prime example.
If another faction takes over the province and cannot build the unit with the bonus, they'll develop the province in the normal, unspecialised way.
If you read through all the other posts in this topic it should explain it all very well....hopefully
Cheers
Bookmarks