nl_tokens: Gets an array of unique items from the current array .
pl_tokens: function unique ( a ) { if ( ! ( a instanceof Array ) ) return a ; var visited = [ ] , unique = [ ] ; libs . object . each ( a , function ( item ) { if ( visited . indexOf ( item ) === - 1 ) { unique . push ( <mask> ) ; visited . push ( item ) ; } } ) ; return unique ; }