Possible Clues:

• Concurrent
• Done at the same time
• In ____ equations, the numbers of unknowns and equations are the same
• At the same time and back in Kansas, poor Aunt Elm is consumed by debts
• Occurring at the same time
• Describe how competitors arrived for photo finish at the same time
• Show off luminous teas at the same time
• It might be occurring at the same time but it's still a coincidence
• Happening at the same time
• Coincidental stimulus externally applied to a funny one