Currently, {HEAD ~ the KNEX rod and connector systems} are marketed in two size categories, {TAIL ~ a “standard” size}, directed to both children and adults, and a larger size, directed more to younger, smaller children, which has larger and softer components, both rods and connectors 
Currently , { HEAD ~ the KNEX rod and connector systems } are marketed in two size categories , { TAIL ~ a “ standard ” size } , directed to both children and adults , and a larger size , directed more to younger , smaller children , which has larger and softer components , both rods and connectors
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