Methods and apparatus to utilize network coding in a wireless network are disclosed. The ECU causes driving power variation operation to be performed on the motor generator in which the motor generator is switched between a first state in which the motor generator generates driving power of a prescribed level and a second state in which the motor generator generates driving power larger than the driving power in the first state to run the vehicle. For example, a support may be snap fit into the base and the base can be slip fitted into recessed channels formed in elongated extensions extending from a top surface of the guardrail block. The composition finds utility as an oral dressing, for example, a tooth whitening composition that is applied to the teeth in need of whitening. The homochiral MOFs are prepared from pure enantiomer struts of formula :The homochiral MOFs are suitable for separation of enantiomers from racemic mixtures.