Techniques for mitigating interference on control channels in a wireless communication network are described. An object-oriented query is executed to retrieve data from a database. The classification predictions are then appended as additional features to the respective feature sets of the items, thereby obtaining enhanced feature sets, and a first classifier is trained, using a plurality of the items as training samples and using the enhanced feature sets of the training samples. Then, the second oxide semiconductor film is selectively etched to form a third oxide semiconductor film, and a second oxide insulating film is formed. The phone then tailors its operation based on the sensed reaction. The combination provides a contiguous surface over which finishing material such as shower tile may be installed.