In B1 enter =A1&A2&A3
In B4 enter =A4&A5&A6
Select B1 through B6.
Pull (lower right hand corner) down to end of column A.
Select the data in column B.
Under Edit > Go To > Special > Go to > Blanks > OK
Under Edit > Delete > Rows Shift Up > OK
Select the data in column B and do a Copy > Edit > Paste Special > Values >
OK