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The hadronization effects induced by various colour connections of the fourquark system in $e^{+}e^{-}$ annihilation are briefly reviewed. A specialcolour connection of four heavy quark system without colour-separation favoursthe production of doubly heavy baryons. For the related three-jet case, thecorresponding hadronization has not been considered. We argue that it can beeffectively described as two string fragmentation besides the leading heavydiquark fragmentation. The production rate and the properties of final statehadron systems are discussed. Emphasis is on the string effect as a fingerprint of this hadronization procedure.

Colour connections of four quark $Q\bar{Q}Q'\bar{Q}'$ system and doubly heavy baryon production in $e^{+}e^{-}$ annihilation