f:X \to Y\ ,\ \ g:Y \to Z
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Recent Referers:
  1. https://formula.s21g.com/formulae/48175
  2. https://formula.s21g.com/?f:X%20%5Cto%20Y%5C%20,%5C%20%5C...
  3. http://blog.s21g.com/?page=11