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Context: ystyr “y gefnffordd” (“the trunk road”) yw ffordd gyswllt yr A55 Caer i Fangor o'i chyffordd â Chylchfan Brychdyn yr A5104 i Gylchfan Brychdyn wrth Gyffordd 36A a chan gynnwys y gylchfan honno, a'r ffordd gangen rhwng Cylchfan Cyffordd 36A a Pharc Manwert