High ammount of bidirectional pairs

[nablator]

The ratio reversible pairs / total pairs at distance 1 is not much different in some natural language texts of comparable length:
10.9% VM Takeshi Takahashi: 37760 tokens, 3546/32409
9.9% Geber, Summa perfectionis (Newman 1991) 33188 tokens, 2434/24599
9.4% VM V101: 40621 tokens, 3327/35234
9.3% Dante Alighieri, La divina commedia: 97206 tokens, 5970/63628
9.0% Christine de Pisan, Le Livre du chemin de long estude: 34810 tokens, 2291/25189
5.8% Speculum Humanae Salvationis (Lutz & Perdrizet 1909): 37021 tokens, 1717/29544