caption: Two vertical parallel lines cut by a transversal. The angles above the transversal are (in descending order): A, B, C, <PERSON>. The angles below the transversal are (in descending order): H, G, F, <PERSON> The top two consecutive interior angles (B and C) are circled in blue, and the bottom two consecutive interior angles (G and F) are circled in red.
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