There are seven pots in a row, numbered sequentially from 1 to 7. A cat is hidden in one of these pots. Every night the cat moves from one pot to its adjacent pot. Every day, you are allowed to check any two of the pots. If you can find the cat, you win! Otherwise, you have to come next day to check any two pots. What strategy will you devise so that you can guarantee to win in minimum possible days?