20. We had better take "persons" as Universe. We may choose "myself" as 'Middle Term', in which case the Premisses will take the form

I am a-person-who-sent-him-to-bring-a-kitten;		${\displaystyle \scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}}$
I am a-person-to-whom-he-brought-a-kettle-by-mistake.

Or we may choose "he" as 'Middle Term', in which case the Premisses will take the form

He is a-person-whom-I-sent-to-bring-me-a-kitten;		${\displaystyle \scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}}$
He is a-person-who-brought-me-a-kettle-by-mistake.

The latter form seems best, as the interest of the anecdote clearly depends on his stupidity——not on what happened to me. Let us then make ${\displaystyle m}$ = "he"; ${\displaystyle x}$ = "persons whom I sent, &c."; and ${\displaystyle y}$ = "persons who brought, &c."

Hence,

All ${\displaystyle m}$ are ${\displaystyle x}$;		${\displaystyle \scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}}$
All ${\displaystyle m}$ are ${\displaystyle y}$.

and the required Diagram is

[See p. 50]