```
def concept one as 1  --> creates a new concept 1
def concept two as 2  --> creates a new concept 2
def concept add(a,b) as a + b   --> create concept that need parenthesis
def concept a plus b as add(a,b)  --> create a concept that mimic human language

one plus two --> recognizes the concept 'a plus b'
one plus two ? --> makes the addition

concept a plus b --> will work on this concept
pre: a is a number 

--> ERROR : 'a is a number' is not known

def concept a is a number as :
    isinstanceof(a, number) 

--> adds concept a is a number
--> add the pre condition to the concept a plus b
```

# Define a new concept in one line
```
def concept words
def concept words [where whereclause] [as expression] [pre precond] [post postcond]
```

# Define a complicated concept
```
def concept 
as:
    ...
where:
    ...
pre:
    ...
post:
    ...
```