WOW, thanks to everyone who responded. I will copy all replies and work through the options to expand my knowledge. Some options are way beyond my skill level (probably obvious with my code above {grin})
For now though I will use the "AND" by Ryan Smith (cuz). I had tried several versions of that approach before posting here, but could not quite get my 84-year old brain around the logic. So simple now that I see it.
Thanks again for all being so willing to share.