- addition (+)
- division (/)
- equality (=)
- equality strong (==)
- greater than (>)
- greater than or equal (>=)
- if unknown (?)
- inversion (-)
- less than (<)
- less than or equal (<=)
- logical and (& or ‘and’)
- logical not (! or ‘not’)
- logical or (| or ‘or’)
- modulo (%)
- multiplication (*)
- power (^)
- subtraction (-)
- unequality (<>)
+31 (0)20 240 21 20 
