A and B are front and side views of a lamp-screen, and C is a dumbbell. [Please select]
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_ Limited anteriorly by hypoplastral bones and posteriorly by xiphyplastral bones (since hypoplastral bones do not articulate medially in hatchlings, anteromedian and posteromedian fontanelles form a single, more or less dumbbell-shaped opening). [Please select]
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