Figure 5: MtQS-DSrdv construction exemplary maps () for channels (); for stands for a particular map of channel . With three available channels, Channel 1 is selected according to the tQ forward manner, and the next two channels are formed from DSs (), that is, : and : . These DSs are exemplary, since others could also be found. While having four available channels, Channel is selected according to the DS rule. Starting with four available channels () the mirror tQ is utilized, changing twice the direction (). With five available channels (), Channel is built using a backward tQ except of one mirror element.