A square is always a rectangle but a rectangle isn't always a square.
A fat is always a lipid but a lipid isn't always a fat is an example of AIABBBIAA.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.