The five unique methods of the given assertion can be composed as follows

(I) A characteristic number is odd shows that its square is odd.

(ii) A characteristic number is odd provided that its square is odd.

(iii) For a characteristic number to be odd, it is essential that its square is odd.

(iv) It is adequate that the number is odd, for the square of a characteristic number to be odd.

(v) If the square of a characteristic number isn’t odd, then, at that point, the regular number isn’t odd