Universal 241: inflection ⇔ free order; ¬inflection ⇔ rigid order
Original
If there is segmental relation marking, word order is free, and vice versa. OR equivalently: If there is no segmental relation marking, then word order is rigid, and vice versa.
Standardized
IF there is segmental relation marking, THEN word order is free, and vice versa. IF there is no segmental relation marking, THEN word order is rigid, and vice versa.
1. Also mentioned in Serebrennikov (1974: 309), among myriads others.2. Beauzée (cf. ##239, 245) considers this correlation to be unidirectional.