Anchor: i'm the youngest in my family until i was uh in junior high school old enough to care for myself when i got home from school
Entailed: I was mature enough to take care of myself at home after school.
Contradiction: I had trouble taking care of myself when I got home from junior high school.
Contradiction: girls sing
Contradiction: There are sandy beaches and mangrove swamps located here. 
Contradiction: The study was conducted by surveying only men.
Contradiction: Someone is building something.