Given the following:
Clear[a, b, c, d, e, f, g, h];
{a, b, c, d, e, f, g, h} /. {a -> 12, c -> 12, e -> 12, f -> 12}
(* {12, b, 12, d, 12, 12, g, h} *)
Is there a more elegant or shorter notation to replace multiple symbols with a similar value?