rem: function( observer ) { if (this.m_observers.indexOf( observer ) == -1) { this.m_observers.push( observer ); } 
add: function( observer ) { this.session.addObserver( observer ); 
context:     addObserver:    function( observer )    {        if (this.m_observers.indexOf( observer ) == -1) {            this.m_observers.push( observer );        }    },
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