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No chain?

I must be missing something obvious: In the first assert you have three family members, one couple and the answer is zero chains. I was expecting an answer of one chain (['Gary', 'Hollie', 'Jeanette']). Why zero and not one?

Created: March 25, 2015, 7:34 p.m.
Updated: March 27, 2015, 10:15 p.m.
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