> For the complete documentation index, see [llms.txt](https://apeleaks.gitbook.io/leaks/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://apeleaks.gitbook.io/leaks/docs-journal/journal-part-4/observatory/room-2-alchemical-laboratory/sentinel-extraction-terminal.md).
# Sentinel Extraction Terminal
As clued by Sentinel Extraction Terminal first letters, these puzzles are a game of SET. Each group of 12 sentinels is 3 valid sets with 3 extras. The rules of SET in this instance would dictate that all the items of a trait must match, or must be different. The highlighted groupings for Group 1 are below.
The three unused sentinel images have two sentinels with a matching trait for each trait type and one different. The different traits are collected below.
Base Armor: **Ice**\
Head: **Laurel**\
Face: **Crystallized**\
Body: **Lab Coat**
The sentinel with these traits is **2116**
The highlighted groupings for Group 2 are below.
The three unused sentinel images have two sentinels with a matching trait for each trait type and one different. The different traits are collected below.
Base Armor: **Ice**\
Head: **Spikes**\
Face: **VR Headset**\
Body: **none**
The sentinel with these traits is **718**
The highlighted groupings for Group 3 are below.
The three unused sentinel images have two sentinels with a matching trait for each trait type and one different. The different traits are collected below.
Base Armor: **Runes**\
Head: **Black Headphones**\
Face: **Crystalized**\
Body: **Black Hoodie**
The sentinel with these traits is **104**
The highlighted groupings for Group 4 are below.
The three unused sentinel images have two sentinels with a matching trait for each trait type and one different. The different traits are collected below.
Base Armor: **Runes**\
Head: **Undead Spikes**\
Face: **Fire Eyes**\
Body: **Trippy T-Shirt**
The sentinel with these traits is **500**
The 4 found sentinel numbers 2116, 718, 104, 500 can be broken up as indicated by the number symbols below each grid to read 21 16 7 18 1 4 5 which can be converted to read **UPGRADE**
