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ProgramNode(0...17)( [:a], StatementsNode(0...17)( [LocalVariableWriteNode(0...17)( :a, 0, IfNode(2...17)( nil, CallNode(2...3)(nil, nil, (2...3), nil, nil, nil, nil, 2, "b"), StatementsNode(6...10)([TrueNode(6...10)()]), ElseNode(10...17)( (10...11), StatementsNode(12...17)([FalseNode(12...17)()]), nil ), nil ), (0...1), (1...2) )] ) )