The best replacement for e1 is t1.

The best alternatives to e1 are rated as following:
★★★★★  t1
★★★★  e2
★★★★  sn1
★★★  e3
★★  e2 reactions
★  e2 ospf
★  sn1 reaction
  e2 mechanism
  e3 office 365
  intel i3
  sn1 reactions
  t1 speed
  e300
  amd a6
  pri
  e500
  amd a4
  fullfield ii

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