Declarer changes designation of card to be played from Dummy
During the play of a No Trump contract, Dummy has a solid 6 card Diamond suit in Dummy and calls for Dummy to 'Run the Diamonds'. After Dummy has led the first 4 Diamonds, Declarer now calls for the lead of a Club. Does 'Run the Diamonds' commit Dummy to run all of the Diamonds? Whatever the decision, what is the relevant Rule?