The key feature of spreadsheets is the ability for a formula to refer to the contents of other cells, which may, in turn, be the result of a formula. To make such a formula, one simply replaces a number with a cell reference. For instance, the formula codice_6 would produce the result of multiplying the value in cell C10 by the number 5. If C10 holds the value codice_7 the result will be codice_5. But C10 might also hold its formula referring to other cells, and so on.