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Dec 17th, 2018
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  1. (λpq.pqp)((λab.a)(λcd.d))
  2.  
  3. (λpq.pqp)((λab.a)(λcd.d)) ➝
  4. λq.((λab.a)(λcd.d))q((λab.a)(λcd.d)) ➝
  5. λq.((λab.a)(λcd.d))q((λab.a)(λcd.d)) ➝
  6. λq.(λb.(λcd.d))q((λab.a)(λcd.d)) ➝
  7. λq.(λcd.d)((λab.a)(λcd.d)) ➝
  8. λq.(λd.d)
  9.  
  10. (λpq.pqp)((λab.a)(λcd.d)) ➝
  11. (λpq.pqp)(λb.(λcd.d)) ➝
  12. (λpq.pqp)(λb.(λcd.d)) ➝
  13. λq.(λbcd.d)q(λbcd.d) ➝
  14. λq.(λcd.d)(λbcd.d) ➝
  15. λq.(λd.d)
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