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							- export class Expression {
 
-   constructor () {
 
- 		this._sourceInfo = null;
 
- 		this._parenthesis = false;
 
-   }
 
-   set sourceInfo (sourceInfo) {
 
- 		this._sourceInfo = sourceInfo;
 
- 	}
 
- 	get sourceInfo () {
 
- 		return this._sourceInfo;
 
- 	}
 
- 	set parenthesis (flag) {
 
- 		this._parenthesis = flag;
 
- 	}
 
- 	get parenthesis () {
 
- 		return this._parenthesis;
 
- 	}
 
- }
 
 
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