An anti-fogging coating material is disclosed which comprises a phosphoric acid compound binder; and oxide particles having an average particle diameter of 1 to 300 nm mixed with the phosphoric acid compound binder and provides an anti-fogging coating with a high hydrophilic property and a high water absorption property, capable of retaining the high hydrophilic property for a long period of time. A system for entering an alphanumeric string includes presentation logic for displaying on a presentation device an alphabet arranged into a row of letters and indication logic for presenting visual cues grouping a series of letters of the row into a cluster. When a set of revoked receivers is identified, the revoked receivers define a relatively small cover of the non-revoked receivers by disjoint subsets. A method of forming the seal is also disclosed. In a second wafer cutting procedure the die are singulated by cutting through along the second set of streets.