Is there a popular Scrabble variation that: 


lets you play double/triple word scores twice, once vertically and 
once horizontally? 
does NOT let you play double/triple letter scores twice? 


This is how I've always played, so it surprised me to learn that 
official Scrabble rules do NOT permit using double/triple word scores 
twice. 

Perhaps this was true in an older version of Scrabble (I started 
playing in the 70s). 


Question: Caching UITableView Images after load asynchronous
Answer: Table view cells are reused every time they are shown/hidden. It allows not to create thousands of cells. So you need to store your loaded images. For example in dictionary with cell's index path as key and image as value. Then check if image for current cell is already loaded, just use it instead of loading again.