The Chirality of Shells

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The Chirality of Shells
Each of the shells has either right- or
left-handed chirality. Identify which shells
belong to each homochiral set. Instructions
follow.
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Right-handed screw axes
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right-handed
right-handed
righthanded
left-handed
right-handed
left-handed
right-handed
right-handed
right-handed
right-handed
Here are the shells again. Solutions to follow.
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The End