marty....@gmail.com
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Advance math write 10 as single character.
/=a
\=b
|=c
-=d
/\=ab
/|=ac
/-=ad
\|=bc
\-=bd
+=cd
Each two character term (explicitly ab, ac, ad, bc, bd) may be reduced to single character symbols by juxtoposition of first and second characters. For instance c=| and -=d were combined to produce +=10.
Key
a=1
b=2
c=3
d=4
ab=5
ac=6
ad=7
bc=8
bd=9
cd=+ where+=n, n=10.