User blog comment:Alejandro Magno/Make an extension of the notation 3 (WHAT IS BAD ABOUT BLOG POSTS VEL?!?!?!?!?!)/@comment-5029411-20141023231850/@comment-25371339-20141023233350

(a)[d] = {a,b,d(1)c}

(a)[d] = {a,b,d(1)c,e}

etc.

(a)[d] = {a,b,d(1)c(1)e}

etc.

(a)[d] = {a,b,d(2)c}

etc.