be paired reciprocally. Even tones are conjoined with inflected ones, and vice versa.

Parallelisms in artistic speech are common in some languages of Mesoamerica, such as Nahuatl (Aztec) and some Mayan languages. It has also been observed in a language of Indonesia (that Fox imprecisely referred to as "Rotinese") and Navajo. Other research has found parallelisms in the languages of the Ural-Altaic area (including Finnish-Karelian