hook: easy contra corners triplet
formation: triplet
| A1 | 4 | ones down the center past twos and threes
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| 4 | ones up the outsides to end in the twos' place while twos move up to ones' place
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| 8 | long lines forward & back
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| A2 | 16 | ones contra corners
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| B1 | 16 | partners balance & swing, all face up the hall
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| B2 | 8 | invert the set, twos separating followed by ones and threes ⁋
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| 8 | partners do si do once
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