+ extRefVariable :: Variable -> <ReadGraph> Variant
+ extRefActiveVariable :: Variable -> <ReadGraph> Variant
+ forRows :: Variable -> String -> Integer -> Integer -> (Variable -> <ReadGraph,Proc> ()) -> <ReadGraph> ()
+ rowCell :: Variable -> Integer -> <ReadGraph> Maybe Variable
+ offsetCell :: Variable -> Integer -> Integer -> <ReadGraph> Maybe Variable
+ cellEditor :: Resource -> <ReadGraph> CellEditor
+ syncExec :: CellEditor -> OperationMode -> (<SpreadsheetTransaction, Proc> a) -> <Proc> a
+ cellColumn :: Variable -> <ReadGraph> Integer
+ spreadsheetBook :: Variable -> <Proc> SpreadsheetBook