t1. Partner leads the King of ♠ and you signal enthusiasm with your 8. Declarer plays low.
t2. Partner now leads a low ♠ to your Ace and declarer again plays low.
t3. You lead a third round of ♠, declarer plays low again, and partner takes his Queen.
t4. Partner exits with a low ♥, and declarer wins in hand with the Ace.
t5. Declarer plays the King of trumps, and partner plays a low ♥.
t6. Declarer now plays the Queen of trumps, and partner discards the 13th ♠.
So declarer started with a seven-card trump suit and is apparently planning to run all his trumps.
What will you discard on t6, t7, t8, t9 and t10 ? Why ?
Hint: What inference can you make about the minor-suit Aces? Why?

Help

South opens 1♥ and partner doubles. North bids 1NT, and you pass. South leaps to 4♥, ending the auction.