I am seeing this code snippet in  a logging node module and I do not 
understand what it is doing?
Can you explain?

var LEVEL = {
  "TRACE": 10,
  "DEBUG": 20,
  "INFO": 30,
  "WARN": 40,
  "ERROR": 50,
  "FATAL": 60
};
for (var l in LEVEL) {
  LEVEL[LEVEL[l].toString()] = l;
}

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