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  • \$\begingroup\$ Since the empty product is 1 is the output for, say 1!1! just an empty string? \$\endgroup\$ Commented Jan 18, 2018 at 20:24
  • \$\begingroup\$ @JonathanAllan 1!1! Reduces to 1! Or 0! \$\endgroup\$
    – tuskiomi
    Commented Jan 18, 2018 at 20:26
  • \$\begingroup\$ Which then reduces to the empty string :/ \$\endgroup\$ Commented Jan 18, 2018 at 20:26
  • \$\begingroup\$ @JonathanAllan I'm going to say 1 is not equal to as empty string \$\endgroup\$
    – tuskiomi
    Commented Jan 18, 2018 at 20:29