“Only two among three” mechanism 2

The block of three yellow disk cams controls motions of three blue followers. After turning the block 120 deg., each follower stays at position YES or NO. This mechanism ensures that only two of the followers stay at position YES.
It may be considered as a logic mechanism. Among three things we can get two YES only. The three YES never happens.
In fact, the best mechanism is the one, in which the user can move the followers to the desired positions directly (not via the cams). However, it seems to me such a mechanism doesn’t exist probably.
This mechanism was made on request of a YouTube viewer. I don’t know where it is used.

Видео “Only two among three” mechanism 2 канала thang010146