public static String getCellIndexLetterKey(final String columnLetter, final int rowIndex) {
    """
	return cell index key with column letter and row index. e.g. $A$0 for A1
	cell.
	
	@param columnLetter
	column letter.
	@param rowIndex
	row index.
	@return String.
    """
		return TieConstants.CELL_ADDR_PRE_FIX + columnLetter + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
public static String getCellIndexLetterKey(final String columnLetter, final int rowIndex) {
		return TieConstants.CELL_ADDR_PRE_FIX + columnLetter + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
public static String getCellIndexLetterKey ( final String columnLetter , final int rowIndex ) { return TieConstants . CELL_ADDR_PRE_FIX + columnLetter + TieConstants . CELL_ADDR_PRE_FIX + rowIndex ; }
return cell index key with column letter and row index. e.g. $A$0 for A1
cell.

@param columnLetter
column letter.
@param rowIndex
row index.
@return String.
return cell index key with column letter and row index . e . g . $A$0 for A1 cell .