1606.lean:1:18-2:6: error: unsolved goals
⊢ True
1606.lean:3:4: error: expected command
1606.lean:8:18-10:8: error: unsolved goals
⊢ True
1606.lean:11:4: error: expected command
1606.lean:19:18-21:14: error: unsolved goals
⊢ True
1606.lean:22:4: error: expected command