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    \$\begingroup\$ Maybe you know this and it's by design (I know that rainbows are not rhombuses or ascii, too, and higher orders' positions get more complicated), but aren't the colours reversed in the 2nd rainbow? \$\endgroup\$ Commented Aug 14, 2018 at 12:42
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    \$\begingroup\$ @ChrisM Ah, you're indeed right. With two rainbows the second is indeed reversed, but with three only the outer is reversed, and with four both outer are reversed. Ah well, bit too late to change it now. Maybe I'll think of a third related challenges with this later on. :) \$\endgroup\$ Commented Aug 14, 2018 at 12:51
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    \$\begingroup\$ @ChrisM Added a third related challenge implementing your comment to the Sandbox. \$\endgroup\$ Commented Aug 16, 2018 at 15:09
  • \$\begingroup\$ Oh cool, nice one :¬) \$\endgroup\$ Commented Aug 16, 2018 at 16:04