mandoc: nested.in:13:2: WARNING: nested displays are not portable: Bd in Bd
mandoc: nested.in:24:2: WARNING: nested displays are not portable: Bd in Bd
mandoc: nested.in:13:2: WARNING: nested displays are not portable: Bd in Bd
mandoc: nested.in:24:2: WARNING: nested displays are not portable: Bd in Bd