The literal checking mode will not consider mathematical equivalence and will only consider the patterns in the student's input. (For mathematical equivalence use Symbolic evaluation mode) The following options are available:

**Set Decimal Separator. ** The default is dot, but it can be changed to comma.

**Set Thousands Separator. **The default is comma, but it can be changed to comma, dot or space.

**Restrict Variables used to. **Enter x,y means the student can only use the characters x or y in their expressions.

**Ignore Alphabetic Characters: **all characters that are non numeric are ignored.

Examples of the other options are:

Option | example | equivalent to |

IGNORE TRAILING ZEROS IN A DECIMAL | 1.00 | 1 |

IGNORE ORDER | 2,3 | 2,3 |

IGNORE ORDER | x,y | y,x |

IGNORE A "1" IN FRONT OF A VARIABLE | 1x | x |

IGNORE LEADING AND TRAILING SPACES | x + 1 | x+1 |

TREAT EXTRA SPACES AS ONE | x + 1 | x + 1 |

IGNORE ALPHABETIC CHARACTERS | 1 apple | 1 |

IGNORE ALPHABETIC CHARACTERS | 2.12 inches | 2.12 |

Consider a case in which the students should build a set of all the real values of x less than 5:

The setup is as follows:

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