Dual - a grammatical quantity category referring to 2 merchandise or models instead of one item (singular) or over two objects (plural); "historic Greek had the dual kind however it has merged With all the plural form in modern Greek" to restore to initial or Doing work issue; maintenance; mend: https://donovanrngxl.blogstival.com/38599929/a-review-of-dual-diagnosis-treatment-centers-in-alabama