It was confirmed by Michael Grant that Sam and Dekka would be on
the back cover of Fear.
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The cast of French for Geordies - 2006 includes: Graeme Kennedy
as Dekka Black
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Sam Orc
Astrid Edilio
Caine Howard
Diana Quinn
Little Pete Albert
Computer Jack Pack Leader
Drake The Darkness
Breeze Dekka
Mary
John
Lana
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If you mean 'dekka' it is a variant of 'dekai' which is an
exclamation more commonly heard from younger folk with less
emphasis on proper pronunciation.
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if the base is 100, Dekka is 101, Hecto is 102, Kilo is 103 and
there are many more including giga and mega