With grep:
Element a is not there
With given-when:
Element a is there

With grep:
Element ab is not there
With given-when:
Element ab is there

With grep:
Element abc is not there
With given-when:
Element abc is there

With grep:
Element 100 is not there
With given-when:
Element 100 is not there

With grep:
Element 1000 is there
With given-when:
Element 1000 is there

With grep:
Element 10000 is there
With given-when:
Element 10000 is there

With grep:
Element abcd is there
With given-when:
Element abcd is there