How to select different different values from two columns through SELECT BY ATTRIBUTE

[المشرف العام]

I'm using ArcMAP 10.3. I'm trying to select by attributes different values from two columns.

I want to define the areas where

1) Main rock is GRAVEL and

2) Sub-rocks are

a- mudstone tephra loess

b- sand mud

c- ...

d- ...

e- sand mud peat

I have tried to do it as shown below



but I got this error



Any idea how can I do this would be appreciated.



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