SPELLED OUT IN ORDER
A set of cards, numbered from 1 to 10, is sequenced and made into a deck held face down. They will be exposed in correct number order using the following procedure:
While spelling out each number word ("o-n-e", "t-w-o", etc.), a card is taken from the top and put onto the bottom of the deck for each letter; after spelling the word, the next card is turned up to reveal the number just spelled out. It is removed from the deck and placed face up.
How must the cards have been sequenced originally?