I believe in the story of the friendship that gradually. It indicates that we are not well-informed and as time goes, we're able to run long distances for the first time, but they must be so earning miles.
I believe in the gradual friendship. It indicates that we are headed and sober. Like run time We can go the distance in the first place, but mileage indefinitely.
I believe friendship slowly. It suggests that we not reckless and conscious, as at the time of running. We can't run the remote at first but to accumulate miles around.