This walkthrough illustrates one of the core mechanisms of PET: the Exist / NonExist qualifier, which helps determine whether a given pattern should be reinforced or avoided.

Rather than being metadata, Exist or NonExist is embedded as part of the Understanding Node, derived from lived experience or strong conceptual association. For instance:

• “Fire” → “Touch” → NonExist
• “Food” → “Eat” → Exist
• “Pain” → NonExist
• “Exercise” → “Pain” → Exist (qualified via source)

This mechanism enables PET to:

• Reconcile conflicting data (e.g., exercise-induced pain vs. injury pain).
• Develop moral and behavioral frameworks organically.
• Establish survival-promoting or experience-affirming pattern chains.

This walkthrough anchors the moral and interpretive framework of PET in actual graph mechanics—no abstractions, only connections and recursive weighting.