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Number of Ranks - Your current ranks in the skill

Wall Position - 9+ is the fastest rank, 2- is the slowest rank right before the wall. If you select a number that could not occur in the pool size (ie, 6+ or higher for secondary) it will adjust it to 2-.

TDPs to Spend - How many TDPs do you have available to spend

Rank to Gain - Calculate for this many ranks gained. Note that it walks through the wall rank cycle for you. Using a larger number, such as 10 or 25 can help when figuring out the best TDP expenditure.