Injury is possible if the magnetic units are allowed to snap together or if nearby metal objects are allowed to be attracted to the magnets.
(Injury; is; possible) (the magnetic units; are allowed; ) (the magnetic units; to snap together; ) (nearby metal objects; are allowed; ) (nearby metal objects; to be attracted; to the magnets)
Injury the magnetic units the magnetic units nearby metal objects nearby metal objects
is are allowed to snap together are allowed to be attracted
possible
to the magnets