How to get your brain exercised

2 friends,

"see" & "saw":

1 day "see" saw sea & "saw" didnt see sea.
"See" saw sea and jumped in sea.
"Saw" didnt see sea but jumped in sea.
"See" saw "saw" in sea & "saw" saw "see" in sea.
"See" "saw" both saw sea & both "saw" & "see" were happy to see Sea.

That is how to exercise your brain..!