variant letter pairs such as Ϝ ϝ, Ͷ ͷ, Ϛ ϛ, Ͱ ͱ, Ϳ ϳ, Ϻ ϻ, Ϙ ϙ, Ϟ ϟ, Ͳ ͳ, Ϡ ϡ, Ϸ ϸ