System and methods related to wagering, such as slot machines andor other electronic games. The hodoscopes are preferably arranged so that their fields of view of the region are approximately orthogonal. A process identifies \u201cwhite\u201d regions in the color image by comparing the intensities of photoexposure of groups of associated pixels which are responsive to photon energy in different spectral regions. The closure structure can have a curved portion configured to extend along a first vessel, such as a side branch of a bifurcated vessel that extends along a lateral axis. The retrieval of stored sentences is guided at least in part by the ease with which the stored sentences may be adapted to produce a grammatically correct sentence, enabling rapid generation of accurate output.