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https://alpha.twizzle.net/edit/?alg=%2F%2F+-----+FB+-----%0Az2+U%27+R+%2F%2F+Form+BL+pair%0Ad%27+r2%27+%2F%2F+Form+FL+pair%2C+preserving+...
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https://alpha.twizzle.net/edit/?alg=%2F%2F+-----+F2B+-----%0Ay%27+D%27+R2%27+r+D%27+%2F%2F+1x2x2+on+L%0AR+l+F%27+%2F%2F+1x2x2+on+R%2C+pre...
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Roux, 39 STM...
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Roux, 35 STM...
