Which two letters must you insert to make up FOUR new words?

See here what other people have answered:

  • O/L
  • S/S
  • M/D
  • S/R
17%
19%
13%
51%
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Interesting fact:

Cool tidbit: J.K. Rowling was mid-flight, soaring through the air, as she came up with the names of the houses in the Harry Potter franchise! She first scribbled them down on the back of a sick bag in an airplane.

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