How many lanes have a Nationality of united states, and a Name of aaron peirsol?
CREATE TABLE table_15621 (
    "Heat" real,
    "Lane" real,
    "Name" text,
    "Nationality" text,
    "Time" text
)
SELECT COUNT("Lane") FROM table_15621 WHERE "Nationality" = 'united states' AND "Name" = 'aaron peirsol'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many lanes have a Nationality of united states, and a Name of aaron peirsol? ### Input: CREATE TABLE table_15621 (
    "Heat" real,
    "Lane" real,
    "Name" text,
    "Nationality" text,
    "Time" text
) ### Response: SELECT COUNT("Lane") FROM table_15621 WHERE "Nationality" = 'united states' AND "Name" = 'aaron peirsol'