A cutting tool has a tool shank and a replaceable cutting head resiliently secured to the tool shank by an interference fit between a male fixation member of the cutting head and a female fixation member of the tool shank. The plurality of flex grooves provides increased flexibility in different portions of a sole of the article. The total pressure in the interior is composed of the partial pressures of the reaction liquid and of the reaction products. Then, a file associated with the test case is generated. The active waveguide section is at least partly covered by the electrode providing the carriers that does not extend to cover the separate ridge section, which thus remains essentially free of carriers injected through said electrode. Path rendering may be accelerated when a graphics processing unit or other processor is configured to identify pixels that are within half of the stroke width of any point along a path to be stroked.