Ferns in the coal swamp A. Zygopterid ferns --
(Ferns in the coal; swamp; A. Zygopterid ferns) Context(Ferns in the coal swamp,List([0, 23))):(A. Zygopterid; ferns; )
Ferns in the coal swamp,List([0, 23))
Ferns in the coal A. Zygopterid
swamp ferns
A. Zygopterid ferns