
Thereon
Physical Placement
Refers to putting something on top of what was mentioned earlier.

He put a card on the table, then a pin thereon.
Emphasis on Location
Used to emphasize the specific place previously mentioned.

You must stand by the gate, not anywhere else, but exactly thereon.
Literary Usage
Often found in formal or literary contexts, not in everyday conversation.

Upon the ancient scroll was a seal, and thereon, the king's mark.
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