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References to 'adjacent'
1. adjacent by Wkbj79
2. circulation and vorticity by perucho
3. constructible angles with integer values in degrees by PrimeFan
4. Farey sequence by ariels
5. Game of Life by PrimeFan
6. harmonic division by pahio
7. partial fraction series for digamma function by rm50
8. presentation of a group by rmilson
9. sohcahtoa by Wkbj79