Task

Produce a formatted   12×12   multiplication table of the kind memorized by rote when in primary (or elementary) school.



Only print the top half triangle of products.




[$100\>[" "]?$10\>[" "]?." "]p:
[$p;! m: 2[$m;\>]["    "1+]# [$13\>][$m;*p;!1+]#%"
"]l:
1[$13\>][$l;!1+]#%