Comparing five column values in a row

Hi All,
I am new to office excel and need your expert help to resolve one issue:

I have five columns in different rows with values and I need to compare all the five columns values.If all five are not same then I want to print TRUE otherwise it should print FALSE. if any of the column has the value as " NOT " then that cell should be ignored while doing the comparison.
for example ,
1 1 1 1 1 should return TRUE as result
1 1 NOT 1 1 should return TRUE as result
1 1 1 2 1 should return FALSE as result
1 1 NOT 2 1 should return FALSE as result.

Thanks in advance for your help..