Assertion: acetaldehyde | /r/AtLocation | second virtual step
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Source sentences:
text: For instance, the amount of acetaldehyde produced in the second virtual step was estimated by subtracting the levels of acetaldehyde found in R1 from those found in R2, while differences in O 2 not SO 2 between both experiments were used as estimators of the amount of O 2 not SO 2 consumed in such virtual second step.