I have been racking my brain trying to solve this puzzle.

I bought two toast racks for the breakfast table.

I need to buy new dish racks for my kitchen.

There are several coat racks in the hallway.

The hat racks in the store were all empty.

There are several coat-racks in the hallway.

There are several bike racks outside the building.

There are several bicycle racks outside the library.

She racks off every time I mention his name.

I saw several power racks at the gym.