Breathable, flushable, porous films and articles made therewith and a process for making these films. The airfoil component includes a flow path surface from which an airfoil extends. In contrast, as modulated signal A, modulated symbols S1 and S1\u2032 obtained by changing the signal point arrangement of the same data are transmitted at time i and time i+1 respectively. Power supply and control means allow selection of which lamps are powered, so that unneeded lamps may be turned off to save power.