Some problems that are easily solved no more than 5 minutes back was denied, the reason that there are 3500 from khan to take difficult steps to respond to later.
Some problems are easy to solve, not more than five minutes back from 3500 was rejected by reason. There are depolarized step takes time to get back to you later.
Some problems easy to solve the maximum 5 minutes was rejected from 3500 the reason for that. There are steps in when overwhelming to take will call back later!