o=vector([0,0,0]) #creates a vector, x= vector([component x1, component x2])
p1=vector([0,2,4])
p2=vector([3,1,0])
q=vector([2,3,4])
q1=vector([2,1,6])
q2=vector([1,3,4])
print "vector OQ=", q-o
print "vector P1Q1=", q1-p1
print "vector P2Q2=", q2-p2
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vector OQ= (2, 3, 4)
vector P1Q1= (2, -1, 2)
vector P2Q2= (-2, 2, 4)
vector OQ= (2, 3, 4)
vector P1Q1= (2, -1, 2)
vector P2Q2= (-2, 2, 4)
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