Solve the puzzle

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Across
  1. 4. day between Tuesday and Thursday
  2. 5. day after Monday
  3. 7. first day of the week
Down
  1. 1. kind of letter days and months start
  2. 2. number of days in a week
  3. 3. Saturday and Sunday
  4. 5. Number of days on the weekend
  5. 6. Sunday through Saturday