"You see Mister Potter, when a pure blood walks into my shop, I have a fair idea of which wand will be there, it will most likely be one of two wands. A wand with their father's wand core and mother's wand wood or a wand with their mother's wand core and their father's wand wood." At this Ollivander tapped the first two boxes revealing a one wand which seemed to be made out of a brown wood Harry assumed was Willow and another wand which Harry recognised as mahogany as it was the same colour as the table at the Dursleys "Give both of them a try for me please."