{}_{t}
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  1. http://formula.s21g.com/?%7B%7D_%7Bt%7D.png
  2. http://formula.s21g.com/?%7B%7D_%7Bt%7D
  3. https://formula.s21g.com/formulae/48341
  4. https://formula.s21g.com/?%7B%7D_%7Bt%7D
  5. https://blog.s21g.com/