Cell specifies the kind content of Spreadsheet cells may have.
Examples:
Parse the text representation to see the internal representation of a formula:
> parse "=A2+B3"
Left (Formula Add (Pair { left = { col = 1, row = 0 }, right = { col = 2, row = 1 } }))
> parse "=sum(A2:A8)"
Left (Formula Add (Range { left = { col = 1, row = 0 }, right = { col = 7, row = 0 } }))
> parse "=sum(B3:B9)"
Left (Formula Add (Range { left = { col = 2, row = 1 }, right = { col = 8, row = 1 } }))
Parse the text representation to see the internal representation of a cell: