User blog comment:Primussupremus/Extending my notation to incorporate multiple entries./@comment-73.235.194.108-20170502154837/@comment-30754445-20170502192829

As an extension, this is actually very well defined:

[3,3,3 | 3,3#3] = [3,3,3 | 3,3,3,3,3]

[3,3,3 | 3,3#4] = [3,3,3 | 3,3,3,3,3,3]

[3,3,3 | 3,3#5] = [3,3,3 | 3,3,3,3,3,3,3]

Simple and sweet.

And thanks to Denis Maksudov's contribution to the previous level, we have:

[a,b,c | d,e#f] ~ fω×2(f).

And let's hope Prim will be allowed to do his own work, when it comes to the next level. 'Cause there sure ain't any point in having other people defining your notation for you.