謎々

"I will let you pass safely," the Sphinx said, "if you can answer my riddle.

He had no difficulty explaining the mystery

The mystery still remains unsolved

Oedipus had answered the riddle correctly

The Sphinx had eaten hundreds of people on their way to the city of Thebes, because they could not answer the riddle the cunning Sphinx had asked them

If he could not answer the riddle, he would be eaten

I can't figure out how to solve the puzzle