Here is a graph of type Venn diagram. The Venne that shows all possible logical relations between a finite collection of sets. Graph `xvenn`

provides funtionality that users can compare values of entities or relations appearing simultaneously in bulletins.

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`v` |
a vector of values, this vector must be greater than 2 |

`e` |
a vector of entities, e.x: "m", "b" |

Result after calling the function `xparse`

has the following format:

file_name:entity:$:list_value_found

...

file_name:entity1:entity2:...:$$:value_e1:value_e2:....:negation

Function `xvenn`

will convert the data format above to a vector. The `xvenn`

uses this vector to display graph of type Venn.
The vector format:

element1 : number of occurences element1 in bulletins

element2 : number of occurences element2 in bulletins

element3 : number of occurences element3 in bulletins

...element1&element2 : number of simutaneous occurences element1 and element2 in bulletins

element2&element3 : number of simutaneous occurences element2 and element3 in bulletins

element3&element1 : number of simutaneous occurences element3 and element1 in bulletins

element1&element2&element3 : number of simutaneous occurences element1, element2 and element3 in bulletins

...

This function returns a vector so that users can check or use it to create new graphs.

`vector` |
return a vector has format above |

Tien T. Phan

`xhist`

type graphique histogram

`xplot`

type graphique plot

`xprop`

type graphique propotion

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