Put the ellipsis back into this sentence

Erict303

LSAT test1 section4
22. It is illogical to infer a second and different effect from a cause which is known only by one particular effect. This is incorrect because the inferred effect must necessarily be produced by some different characteristic of the cause than is the observed effect, which already serves entirely to describe the cause.

Could you help me put the ellipsis back into this sentence? Thank you!