Ace and small ones (in plain suits).
Lead ace, with five or more in suit.
Lead a small one after ace (the original fourth-best if an American Leader).
Lead lowest, with only four in suit, the cards being of a lower denomination than in the leads already enumerated.
King, queen, knave, ten, with or without others.
Lead ten, even though one of your others is the nine.
(a.) If ten wins the trick:—
With more than five in suit, lead knave after ten.
With five in suit, lead queen after ten.