Take the following as truth: and i have the same problem i mean you can tell him from me but it doesn't matter i mean i've i've had greasy fingernails for years  and it still takes me twice as long as i think it's going to take to do the job
Then the following statement: "Does it take you twice as long to do the job because of greasy fingernails?" is true, false, or inconclusive?
Answer: Inconclusive