It would be just about unthinkable to have zero sell trades in any 20 day period on a M1 chart.

This only relates to the lowest time frames. If you're trading the 4H chart, this discussion means nothing to you. The point being, the 2 largest semafors can be interpreted and used differently depending on the time frame. Respecting the Daily Open, ADR and Index Entry can give you the breadcrumbs needed to determine the semafor bias considered on lowest time frames