english: An allocation of positions by letter of the Greek alphabet (α-γ) and the substitution pattern nomenclature common for homoaromatic systems (ortho, meta, para) are used sometimes.
non_english: Alokasi posisi ku huruf abjad Yunani (α-γ) lan pola substitusi nomenclature khas kanggo sistem homoaromatik (para ortho, meta,) digunakake kadhangkala.