A set of letters in ward school

The question asks for a "set of letters in ward school". This is a bit ambiguous, but it likely refers to the letters that make up the phrase "ward school".

The letters in "ward school" are: w, a, r, d, s, c, h, o, o, l.

To represent this as a set, we list each unique letter only once.

The unique letters are: w, a, r, d, s, c, h, o, l.

Therefore, the set of letters in "ward school" is {a, c, d, h, l, o, r, s, w}.

Set of letters: {a, c, d, h, l, o, r, s, w}