Deal
13 cards each player.
Impure Seq
Impure sequence uses a joker to stand in for a missing rank while staying one suit.
Short answer: Impure sequence uses a joker to stand in for a missing rank while staying one suit.

13 cards each player.
Sequences and sets.
Validate then submit.
Lay cards face-up to teach a friend the same rule in one minute.
Use sort/group buttons to visualize—then manually verify melds.
Confusing set ranks with sequence order—re-read the direct answer above.
Impure sequence uses a joker to stand in for a missing rank while staying one suit.
No for standard 13-card declare—at least one pure sequence is required.
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13-card rule learning · practice with friends · learn rules then install.