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Code Golf

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    \$\begingroup\$ Nice answer. Some things to golf: the I# can be Ð (Duplicate is indeed not allowed, but triplicate is still available); and the ε and } can be removed, since l'€ƒQ vectorizes the list automatically. \$\endgroup\$ Commented Jul 23, 2020 at 11:48
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    \$\begingroup\$ Instead of modifying the current word you can intersperse (.ý) ["and", "and", "and"] with it, flatten the list, and the use the final join to add the spaces: #Ðl'€ƒQÅÏ'€ƒ3иs.ý}˜ðý \$\endgroup\$ Commented Jul 23, 2020 at 12:15
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    \$\begingroup\$ Nice new approach. You can golf 1 more byte by changing the Þ5£ to 5∍ \$\endgroup\$ Commented Jul 23, 2020 at 12:57