- My pincode is the past 8 digits of pi: 6x9 ENGINEER lined ruled paper notebook notes
- My pincode is the past 8 digits of pi: 6x9 ENGINEER blank with numbers paper notebook notes
- Retired engineer: 6x9 ENGINEER grid squared paper notebook notes
- Retired engineer: 6x9 ENGINEER blank with numbers paper notebook notes
- Engineer I'm right: 6x9 ENGINEER blank with numbers paper notebook notes