釋氏要覽 1.108

1.108

此云學法女似今尼之長髮也。四分律云。十八歲童女應二歲學謂二歲練身以六法練心（文多不載）。

This is translated as 'woman training in the Dharma'; she resembles the modern long-haired nun. The Dharmaguptaka Vinaya says: An eighteen-year-old maiden should train for two years—meaning that for two years she trains her body, and trains her mind through the six dharmas (the text is voluminous and not recorded here).