A careless attendant had hooked the <e1>padlock</e1> of the monkey <e2>cage</e2> in the staple, but had not locked it.
A careless attendant had
A careless attendant had hooked the padlock of the monkey cage in the staple, but had not locked it.
<triplet> padlock <subject> cage <object> Component-Whole(e1,e2)