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This test is run by .
Note that your final mark will not be saved in the system.

7 - Context-free Languages Wipeout

Target Level

Running Total

For this question there are 4 correct answers. For each correct answer you will score 1 mark.
Be careful, if you get one wrong you are wiped out!

According to the definition below, identify all valid examples of 'element'.

<element> ::= <digit> <digit> | <digit> <digit> <string>
<string> ::= <char> | <char> <string>
<char> ::= a|b|c|...|z
<digit> ::= 0|1|2|...9

Good luck! For each correct answer you get 1 mark.

Pass Mark

75%