Here is another mnemonic for mradi. Mradi, it sounds like radiator. What does a radiator do? Heat a house! What does a house have? A family! What does a family have? Children! What do children have for homework? Projects!
That's so absurd, it may actually work. (And my mother thinks my method for remembering that William McKinley was the 25th president of the U.S. is bad - there's Mt. McKinley; it snows on mountains; it snows on Christmas; Christmas is on the 25th.)