An inkjet printing system includes a stage configure to mount a substrate thereon, a head unit which drips ink onto the substrate, and a moving device which moves the head unit to predetermined positions. This can be implemented with an M1 demultiplexer, tunable Bragg grating filters and a 1M multiplexer. The two laser beams can be first directed towards one side of the photoresist. For example, the system can determine a value of an initial hand of two cards in blackjack, while only one card is face up.