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  • \$\begingroup\$ 90 bytes by dropping x from (#) and using a list comprehension for f: Try it online! \$\endgroup\$ Commented Nov 15, 2022 at 15:52
  • \$\begingroup\$ 88 by merging (#) with the test function x: Try it online! \$\endgroup\$ Commented Nov 15, 2022 at 16:20
  • \$\begingroup\$ 80 bytes by putting (#) into the list comprehension where k is given from context: Try it online! \$\endgroup\$ Commented Nov 15, 2022 at 16:24