2. Reduce the following expressions to a minimum sum of product (minimum SOP). The number of literals and terms are shown.

1. xyz + xyz + xyz + xyz (2 terms, 7 literals)
2. abc + abc + abc + abc (2 terms, 4 literals)
3. xyz + xyz + xyz + xyz + xyz (2 solutions each with 3 term, 6 literal)
4. xyz + xyz + xyz + xyz + xyz + xyz (3 terms, 5 literals)