I love Upper bound, least or LUB. If the supremum exists, it may or may not belong to S. If the supremum exists, it is unique. (Tryagain, where can you find a Buah Kedondong?) Mr Nice "Buah Kedondong" (Great Hog Plum). I found quite a number of trees on top of Jelutong Hill.
I love questions (Mr. Nice asks, "Where is Jelutong Hill?" Along the heights to the east of Padang West Sumatra.