I am trying to unmatch the palindromes observed in a set of words.I'm able to write the syntax to match palindromes.However,I am finding it difficult to write a syntax that unmatches the palindromes and print the rest.

For Example,The syntax should match these set of words.

```
acritan
aesthophysiology
amphimictical
baruria

```

and leave the words such has

```
anallagmatic
bassarisk
chorioallantois
coccomyces
commotive
engrammatic
glossoscopia

```

If you observe the above words have palindromes in the middle like 

```
anallagmatic has "alla" in the middle
engrammatic  has  "amma" in the middle

```

So here is my syntax for capturing the palindromes.

```
(\w)(\w)\2\1

```

I need a syntax that captures the opposite of what my above syntax is capturing