Please also explain the answer.

Show how to define the following languages over = {0, 1} using only , the alphabet symbols 0 and 1, and the operations of union, concatenation, and closure. Note: Your answer cannot use the intersection or complementation operation. Below or always means inclusive or.

(c) All strings that do not have 111 as a substring.

(d) All strings of odd length that have 0000 as a substring.

e) All strings w satisfying condition (i) or condition (ii): (i) w has at most three occurrences of 0; (ii) w has at most three occurrences of 1.