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= (-i + 13j+2k)
b=5i+4j+k
c=4i-j+k
a+2b-3c
(i+2j+3k)+(10i+8j+2k)-(12i-3j+3k)
i+2j+3k + 10i+8j+2k - 12i+3j-3k
-i+13j+2k