User blog comment:Googleaarex/Make an extension of the notation/@comment-5029411-20140926211035/@comment-5029411-20140928152417

Extension 13:

a,-b = a-(-)(-) (-) ...(-) (-) (-)   -a /w b (-)'s

a,--b = a-(-)(-) (-) ...(-) (-) (-)   -,-a /w b (-)'s

a,,-b = a,-(-)(-) (-) ...(-) (-) (-)   -a /w b (-)'s

a,--b = a,,,...,,,-a /w b commas

a,---b = a,,,...,,,-,--a /w b commas

a,-,--b = a,-,,,...,,,-a /w b commas

a,---b = a,-,-,-...,-,-,--a /w b commas

Limit is a,,, ...- - -b.