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    <p>The parentheses are not part of the grammar, but added
to show the parses.
...
(6-(-(-(--1))))==6
(6-(-(-(-(-1)))))==5
(6-(-(--(-1))))==4
  2. or download this
    Length 1, Parse 0, value==(6-1)==5
Length 2, Parse 0, value==(6-(-1))==7
Length 3, Parse 0, value==((6--)-1)==5
Length 3, Parse 1, value==(6-(--1))==6
Length 3, Parse 2, value==(6-(-(-1)))==5