Revision b1a9f7dc-06ad-4ea4-8f5e-224585412498 - Code Golf Stack Exchange

# JavaScript (ES6), 108 bytes

Expects `(u)(v)`.

_Disclaimer: Either that's correct, or I completely misunderstood the challenge._

<!-- language-all: lang-javascript -->

 u=>v=>(g=(i,j)=>u.map((_,k)=>t[k]+=u[p=(i+k)%7]*v[q=(j+k)%7]-u[q]*v[p]))(1,3,t=u.map(_=>0))+g(2,6)+g(4,5)&&t

[Try it online!][TIO-mdnd2rqm]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-mdnd2rqm]: https://tio.run/##nVNNc5swEL37V2w008wqYGpwE8@Uik6PPfTKhXo8mA8HQwTBINvTpn/dXQk7TVL34F6Qdt/bt3o7yzpW8SZpi6YbyzrNDrk49CJQIsCVwMJecxH0zkPcIC7skoIuKueW6KOGUKvk72bzGxU9ClwPwbiPHnWmmXOOrj21OzGUL0Qw4dxaoWff6eODfcuvr7tDUstNByEIiBzH@dK28R5nfO6P8rrFKutgT9DEp@MTzOiwLA4/RgAaqvuOQMZ8ik/03UDfDfTdiQ4wNOoJDk9@oOQgArCwBCFgx7n/gqn@zdy/Zm6JmWPPUR3TRY5bp83SPskQGxsSU9yABVdXiQ0TDgG4HLr7tt4CK6SKqyKFNtv0VcdeKktS3jp5IdOvMs12qLTOqYt2bwnAXxI@A24jOddvG7sUsTGDj8Asxqknyxh9UdKHmlIaYDIAYJo9jYZ2dZU5Vb1C0qUOT6PhCTE94Vvc3Tt5VdOIzbWNZVo/IIcb8G7vOLzXh38sWF5aELrPk15of28r3An8pJk9070L6CdP7LuMlUtbsVQee4PlGLpGzkw3JglFuxt6f3LLIXdGc4lGVXn8nKpW4a@lj1L@6OhGXWZeeZfRp/83K3JlkSftbPq3MTWMC5UNhdlsRcukvKjQ/7ya8rN6RktvHZIHcz8nbOrPqBPmGcw08Q@/AQ "JavaScript (Node.js) – Try It Online"