A replaceable ink container of an ink supply device includes an opening plug for plugging an insertion opening into which a male connector is to be inserted. The size of the restriction is selected to achieve a desired capacity reduction for the refrigerant system compressor. The controller can monitor the temperature within each processor core. The protruding head has a length along the longitudinal axis and a maximum width transverse to the longitudinal axis such that the length divided by the maximum width defines an aspect ratio for the protruding head that is equal to or greater than 1. The answer selection unit analyzes a correspondence relation among extension words included in a second search result, determines the feature word and a constructive part of an answer equivalent word in the second search result based on an analysis result, and selects a word determined to be an answer.