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Are you Colin Isaac, author of the books below?
A Good Catch by Colin Isaac Cynhyrchion Graffig Y Llyfr Gwaith by Colin Isaac Dylunio a Thechnoleg by Colin Isaac Mathemateg Cyfnod Allweddol Tri by Colin Isaac Dylunio a Thechnoleg Tgau by Colin Isaac Mathemateg Cyfnod Allweddol Tri by Colin Isaac Peirianwaith prisiau by Colin Isaac Cynhyrchion Graffig Y Llyfr Gwaith by Colin Isaac Camu 'Mlaen by Colin Isaac Wynebu'r Dyfodol by Colin Isaac


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