lib/elevator-engine/elevator-engine.js
function(level, callback) {
                _getFloors(config, level, floor, function(error, floors, options) {
                    return callback(error, floors, options);
                })
            }
function(level, callback) {
                _getFloors(config, level, floor, function(error, floors, options) {
                    return callback(error, floors, options);
                })
            }
function ( level , callback ) { _getFloors ( config , level , floor , function ( error , floors , options ) { return callback ( error , floors , options ) ; } ) }
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