'It can be a nuclear reactor or an assemblage of things laid one upon the other'
a pile
PASS THE Ps: It can be a nuclear reactor or an assemblage of things laid one upon the other
It can be a nuclear reactor or an assemblage of things laid one upon the other
It can be a nuclear reactor or an assemblage of things laid one upon the other
PASS THE "P"s
a pile
PASS THE "P"s