I must be totally not undertanding the help:
Null values persist through logical expressions in most cases. The following table describes the behavior of null values in logical expressions.
Logical expression Result if x=TRUE Result if x=FALSE Result if x=.NULL.
x AND .NULL. .NULL. FALSE .NULL.
x OR .NULL. TRUE .NULL. .NULL.
NOT x FALSE TRUE .NULL.
.·*´¨)
.·`TCH
(..·*
010000110101001101101000011000010111001001110000010011110111001001000010011101010111001101110100
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