You are the dealer. You have a pack of just 28 cards, there being seven cards
(Ace to seven) in each suit.
You shuffle to perfection, and deal five cards to Ayelet (only),
leaving the balance of the pack face down down on the table..
Ayelet lays four of these cards face up on the table in a row.in front of you.
You have never seen the fifth card dealt to her. Yet Ayelet has unambiguously
indicated just what this fifth card is, its number and suit.
What did she tell her partner before you dealt ?
Note that at this stage no other cards have been dealt.
Ayelet keeps the retained card well hidden.
And Ayelet has NOT communicated to her partner in any way,
once you started dealing.
But her partner can see the row of cards laid before you.