15. 0
    	0	0
    0

    0

    Let "persons" be Universe; ${\displaystyle m}$ = "patient"; ${\displaystyle x}$ = "children"; ${\displaystyle y}$ = "that can sit still".

    No ${\displaystyle x}$ are ${\displaystyle m}$; No ${\displaystyle m^{\prime }}$ are ${\displaystyle y}$.	${\displaystyle \scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}}$	∴ No ${\displaystyle x}$ are ${\displaystyle y}$.

    i.e. No children can sit still.

16. 0			0
    	0	1
    	0

    0	1

    Let "things" be Universe; ${\displaystyle m}$ = "fat": ${\displaystyle x}$ = "pigs"; ${\displaystyle y}$ = "skeletons".

    All ${\displaystyle x}$ are ${\displaystyle m}$; No ${\displaystyle y}$ are ${\displaystyle m}$.	${\displaystyle \scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}}$	∴ All ${\displaystyle x}$ are ${\displaystyle y^{\prime }}$.

    i.e. All pigs are not-skeletons.

[See pp. 52, 3]