Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 
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Question: Topic: Solar energy
 Argument: Producing solar cells need not use fossil fuel energy.

Answer: in favor


Question: Topic: Constitutionality of US health insurance mandates
 Argument: Enforcing mandates may intrude on Constitutional rights.

Answer: against


Question: Topic: Open primaries
 Argument: Open primaries can be modified to limit costs.

Answer:
in favor