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By definition, wick ships are extensible through introduction of more "bits" of the wick it is based on (such as 114P6H1V0's non-monotonic frontal part).
A "puller" is a wick ship for a frontal-stabilized wick; see Lightweight spaceship for a c/2 wick that needs frontal stabilization by two "fishes" (orthogonal standard spaceships). A "pusher", on other hand, is one stabilizing the rear (e.g. 114P6H1V0).