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Arithline

Rules:

1. Rows and columns (lines) may not contain duplicate digits, or 0.
2. Consecutive numbers should be read as decimal numbers.
3. Filled cells represent separators, and may contain operation symbols.
   • The default operation is addition.
   • Precedence rules are respected, i.e. multiplication is always executed before addition.
   • Multiple separators are collapsed into one.
4. Lines may be denoted by the result of the above operation.

To input digits, use numeric keys 1-9. For pencil markings, use shift+[1-9].