rem: _153.shift(); 
add: _304.shift(); 
context: },chain:function(p,q){var self=MochiKit.Iter;var m=MochiKit.Base;if(arguments.length==1){return self.iter(arguments[0]);}var _153=m.map(self.iter,arguments);return {repr:function(){return "chain(...)";},toString:m.forwardCall("repr"),next:function(){while(_153.length>1){try{return _153[0].next();}catch(e){if(e!=self.StopIteration){throw e;}_153.shift();}}if(_153.length==1){var arg=_153.shift();this.next=m.bind("next",arg);return this.next();}throw self.StopIteration;}};},takewhile:function(pred,seq){
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