In building a string based on THREE (or FOUR maybe in the future) columns
using CONCATENATE I am putting a "+" between each columns values. Problem is
that sometimes a value is blank, and therefore I don't want extra "+" in the
result. Please help me get "I Want" string results without a hideous nested
if statement. It is acceptable to add columns which store interim values to
help build string-- this is not a seen workbook. The "I Want" values
ultimately go into a Pivot table along with some other columns.

COL A COL B COL C My Result I Want
OK?
------- ------- ------- ---------------------
--------------------- -----
RED WHITE BLUE RED+WHITE+BLUE RED+WHITE+BLUE Y
RED WHITE RED+WHITE+ RED+WHITE N
+WHITE+ WHITE
N
RED RED++ RED
N