Why It Exists
Quickly separate a familiar 52-card deck from the full 150-card Tau deck.
2 instances
Standard Deck
Corner triangles identify the 52 cards that form a standard playing-card deck.
Uses in Play
Use the 52 marked cards for standard playing-card games. Ranks 1–13 represent ace through king.
For other designs, use membership as a binary property or keep the familiar 52 cards as a core within a larger deck.
Relationships
The marked set contains Club, Spade, Heart, and Diamond at ranks 1–13: 52 marked cards and 98 unmarked cards.