A technique is disclosed to detect a specified mark that has been rotated by an unknown number of degrees. The oven includes a cavity receiving food; a convection assembly provided in plurality, each convection assembly including a heater that heats the food, and a fan blowing air heated by the heater toward the food; and at least one covering member covering at least one of the fans, wherein the fans have respective shafts that are different in height from a bottom surface of the cavity. The cutting head has guiding segments that extend from a forward end to a rear end of the cutting head. In one form of the invention, the data entry portion comprises a visual representation, on a display device, of an MLPP telephone keypad, and a data input device. Also provided are compositions and delivery agents that include the disclosed antibodies and fragments and derivatives thereof; cells that produce the same; methods for producing the same; methods of using the same for detecting, targeting, andor treating tumors andor metastatic cells derived therefrom andor tumor stem cells; and methods for predicting the recurrence of cancer in a subject. In an example, the first and second piezoelectric films can be sized and shaped to be disposed on an upper lip of a subject.