Create a map that converts 3-letter abbreviated days to their full names. All abbreviations should be uppercase and full names should be properly capitalized.
Examples:
Input: getDaysMap()
Output: {
"MON" => "Monday",
"TUE" => "Tuesday",
"WED" => "Wednesday"
}
Input: daysMap.get("MON")
Output: "Monday"
Input: daysMap.get("FRI")
Output: "Friday"
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