If “Some obsessive-compulsive behaviors are not curable diseases” is true, what is the truth value of the following statements?

a. All obsessive-compulsive behaviors are curable diseases.
b. No obsessive-compulsive behaviors are curable diseases.
c. Some obsessive-compulsive behaviors are curable diseases.

Use the traditional square of opposition to find the answers to these problems. When a statement is given as false, simply enter an “F” into the square of opposition and compute (if possible) the other truth values.