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in a milder way , black monday caused the collapse of the pegging of the pound to the exchange rate mechanism 10 years ago under john major
mewn ffordd llai difrifol , achosodd dydd llun du i'r broses o hoelio'r bunt yn erbyn y peirianwaith cyfraddau cyfnewid chwalu 10 mlynedd yn ôl o dan john major