Premise: A group of girls sit back to back .
Correct statement: There is a better than even chance that a group of girls are sitting on the road .
Incorrect statement: There is little chance that a group of girls are sitting on the road .
Correct statement: It is impossible that a group of girls are posing for a picture .
Incorrect statement: It is highly likely that a group of girls are posing for a picture .
Correct statement: It is probable that some girls are resting against each other .
Incorrect statement: It is unlikely that some girls are resting against each other .
Correct statement: We doubt that a group of girls sit with their backs to each other during school .
Incorrect statement: It is almost certain that a group of girls sit with their backs to each other during school .
Correct statement: It is probable that girls leaning against each others backs .
Incorrect statement: It is probably not the case that girls leaning against each others backs .