What's your intention?

for B2, for instance, you seem to want to not allow any entry equal to
anything in columns C, F, G or J. If that's the case try

=COUNTIF(C:C,B2)+COUNTIF(F:F,B2)+COUNTIF(G:G,B2)+C OUNTIF(J:J,B2)=0


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daddylonglegs
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