Detailed Instructions: You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Q: The answer is 9 stones (or maybe more).

After adding a look-alike to 9 stones, there will be 10. Name them ABCDEFGHIJ.

"ABC<DEF" means "the stones ABC as a group weigh less than the stones DEF."

Weighing 1. Weigh ABC vs. DEF.

If ABC<DEF:
--Weighing 2. Weigh ABC vs. GHI.
----If ABC<GHI, the look-alike must be light and among ABC.
----Weighing 3. Weigh A vs. B.
------If A<B, the look-alike is A.
------If A=B, the look-alike is C.
------If A>B, the look-alike is B.
----If ABC=GHI, the look-alike must be heavy and among DEF.
----Weighing 3. Weigh D vs. E.
------If D<E, the look-alike is E.
------If D=E, the look-alike is F.
------If D>E, the look-alike is D.

If ABC=DEF, the look-alike must be among GHIJ.
--Weighing 2. Weigh G vs. H.
----If G=H, the look-alike candidates are I and J.
----Otherwise, the look-alike candidates are G and H.
----Weighing 3. Weigh one of the two candidates against A.
------If they differ in weight, the look-alike is that candidate, otherwise it is the other candidate.

If ABC>DEF:
--Weighing 2. Weigh ABC vs. GHI.
----If ABC>GHI, the look-alike must be heavy and among ABC.
----Weighing 3. Weigh A vs. B.
------If A<B, the look-alike is B.
------If A=B, the look-alike is C.
------If A>B, the look-alike is A.
----If ABC=GHI, the look-alike must be light and among DEF.
----Weighing 3. Weigh D vs. E.
------If D<E, the look-alike is D.
------If D=E, the look-alike is F.
------If D>E, the look-alike is E.
A:
What is the maximum number of identical stones so that after a look-alike is added...?