A drill in which a cutting head is releasably mounted on a tool shank. Testing may be done using standard laboratory procedures for calcium detection, or may be done cow-side using a suitable test for calcium levels, such as a water hardness test kit or a suitable test strip. Each of the plurality of web transport rollers has a roller circumference that is substantially equal to an integer fraction of a span of the web of media along the web transport path between two successive print locations. The signature identifies the contents of the packet despite the encryption obscuring the contents. It performs audio-correction processing of audio obtained through the sound-collection part according to the relative relationship between the direction in which the display part displays images and the direction in which the imaging part shoots. In particular, methods for treating cancers by administering lenalidomide in combination with artemisinin or a derivative thereof are provided.