A razor cutter for hair using a blade having one or two accordion shaped cutting edges to allow a feathered cut of hair strands at different points when the cutting edge of the blade contacts hair. The element includes end caps with pleated filter media extending there between. The character tables at the first level store 2-character strings and the character tables at a subsequent level store strings that are one character longer than the strings stored in the character tables at the level prior thereto. Then, for each parent node in the tree, the system determines counts of one or more performance states for descendants of the parent node in the tree.