rem: _142+=step; 
add: _147+=step; 
context: },islice:function(seq){var self=MochiKit.Iter;var m=MochiKit.Base;seq=self.iter(seq);var _142=0;var stop=0;var step=1;var i=-1;if(arguments.length==2){stop=arguments[1];}else{if(arguments.length==3){_142=arguments[1];stop=arguments[2];}else{_142=arguments[1];stop=arguments[2];step=arguments[3];}}return {repr:function(){return "islice("+["...",_142,stop,step].join(", ")+")";},toString:m.forward("repr"),next:function(){var rval;while(i<_142){rval=seq.next();i++;}if(_142>=stop){throw self.StopIteration;}_142+=step;return rval;}};},imap:function(fun,p,q){
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