{"download":{"MP3":"http:\/\/downloads.cs50.net\/2012\/fall\/lectures\/4\/week4m.mp3","MP4 (240p)":"http:\/\/downloads.cs50.net\/2012\/fall\/lectures\/4\/week4m-240p.mp4","MP4 (360p)":"http:\/\/downloads.cs50.net\/2012\/fall\/lectures\/4\/week4m-360p.mp4","MP4 (720p)":"http:\/\/downloads.cs50.net\/2012\/fall\/lectures\/4\/week4m-720p.mp4","MP4 (1080p)":"http:\/\/downloads.cs50.net\/2012\/fall\/lectures\/4\/week4m-1080p.mp4"},"srt":{"afr":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/afr\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=Td1lpOPt1EaZgIv2wnOCg%2FGZZss%3D","alb":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/alb\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=W3CNGXrLSEF%2B7MLwgclq0Behv68%3D","ara":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ara\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=BLKIgs6hxvH%2FPB8Rnb4EElAjq04%3D","aze":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/aze\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=qGbHBkGrFBLSrl1JM%2Bg%2B6CKghHk%3D","baq":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/baq\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=0YE1vy1elFA6eb%2FO20hjgLklMic%3D","bel":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/bel\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=nL1Omp8ZO8L80rPnayS9ezX%2Bz5A%3D","ben":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ben\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=YxsZMPsSewZ%2BpmOYuYNefBzlFcM%3D","bul":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/bul\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=%2Fa7KOMhtW0iwwXe5w1cOVZau86U%3D","cat":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/cat\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=stInpdU7dYV5on4hJEu43T2eyxg%3D","chi_hans":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/chi_hans\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=SQZJ%2BomTBPVCh5CtKzpL5Wxe%2BaY%3D","chi_hant":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/chi_hant\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=FzOGY%2Bmv64eDiepkxjftwOKY14o%3D","cze":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/cze\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=%2FI%2BzMoIdcnBIyNp%2BTW7Vc%2FfuGR0%3D","dan":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/dan\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=BC94JkZB1vbRMEkFMuQx1LXZQJE%3D","dut":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/dut\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=WF6pAFIWoEwzznx3N9NgCrFubEY%3D","eng":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/eng\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=QHK2v75GA3tqhKXnHoCPvFBGwEI%3D","epo":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/epo\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=RMCaCW%2F6coECTzlaDPAkR%2F18IBI%3D","est":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/est\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=7Ig3fXNX%2BUiqLwiMKqBtpxsG5FA%3D","fil":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/fil\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=sGlX4ogZAqjbsq5mLc5nLyD1stM%3D","fin":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/fin\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=L%2FLK9jHw6kOKfCZzuMVu8J29azQ%3D","fre_fr":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/fre_fr\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=eLgmTNUGXxBV4qy0aGDYdII6Aw4%3D","geo":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/geo\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=W5TlnFkl4Z4b9XArI9F%2F5GrMPJ4%3D","ger":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ger\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=T%2B57bNlUGtA7zv7%2BRh2W%2BvPbj%2Fw%3D","gle":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/gle\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=4Em44418iWwwtF0jY27M%2Bzey9v0%3D","glg":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/glg\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=688VfNp9Wc3YJBziOed5N0JsYPM%3D","gre":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/gre\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=w2Pv47Z3SxzkIab7Co2z3%2F7FhTQ%3D","guj":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/guj\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=cHFQbLhK0Ed9eG9kuYfPcfYn%2BMU%3D","hat":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/hat\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=noabKXgG2QN0D6jdrU9Ih7Skk7M%3D","heb":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/heb\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=MTaKVNW9XbTH7hbJmUDswj9MssI%3D","hin":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/hin\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=9s5RSSEjyl7pHqEEkrETUaF2oyA%3D","hun":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/hun\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=uBd1WsfptwENe6Zr8ahz3l%2BMBUk%3D","ice":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ice\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=Xsh2B1yfjm5K%2FaukZMS4iuOxkg0%3D","ind":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ind\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=b1Ml3DLLfuST9YaZNwTKamkkbbc%3D","ita":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ita\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=4gn0xCXX39FU9k3SSX7tbf4Dy5U%3D","jpn":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/jpn\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=LjaJtjxKCiubmu5cMkbzP7BFD4M%3D","kan":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/kan\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=YFuBu3hVeTOGQirJCmkSJ3UE%2BVw%3D","kor":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/kor\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=u9wIWk2tKIuocfc1dS4up%2BYvGUs%3D","lat":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/lat\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=bUt%2BUaae1a7WCRv0BUMM6e0VQQg%3D","lav":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/lav\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=S8euj9VPt31SoDg7wFK%2Bye9CHmQ%3D","lit":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/lit\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=Z0DP8YpP%2FjWVin%2BRFD%2BYukZNXSU%3D","mac":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/mac\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=LGg5dy5WiskMDoNZcYpHNbQ9g5c%3D","may":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/may\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=iCPIdEeIFDtpTe3QOtMzdWzl3e0%3D","mlt":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/mlt\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=MmIyK3cc82gsH%2Bo%2B9lK995AuIyg%3D","nor":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/nor\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=H%2FU%2FCcxFPjnb%2Fh%2BlNv%2BiH1j%2F364%3D","per":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/per\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=99ICKhxgw5KGwa5%2F7R3%2BKRU46kY%3D","pol":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/pol\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=7N%2FuaSbHFH1mjdhzLsr63W7ndEg%3D","por_pt":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/por_pt\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=B4ir5eA7ZoHBqb1pAF5SXE0P%2Byg%3D","rum":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/rum\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=%2BK0Digy%2BCzIxjHlmbnfUx0q9nUA%3D","rus":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/rus\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=cnBl4aHweOUf9Un6hpUWJe%2Brs2A%3D","scc":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/scc\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=1E0eszbnhoh9XjMT%2B6fh2Hspcw8%3D","scr":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/scr\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=6YNGBZsRFgFMCQlNk5Z6qTFkyus%3D","slo":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/slo\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=2Xu%2BUKOpXIEXLYAaZFWc3iBS4Qg%3D","slv":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/slv\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=cz%2BvDSAuQ3RSAJS1tr4GSXihFOw%3D","spa":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/spa\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=XL0tqinnfOG%2Fn9R0yHlAmO%2FmHzA%3D","swa":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/swa\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=tOJaq3aMdHxWVESc8y4qBL9o1lM%3D","swe":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/swe\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=mqTbxMpGyC%2FkBCzKPMsvOsIQA%2Fc%3D","tam":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/tam\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=z6JQ3pGoq5UoJWs9zNHfXznrePM%3D","tel":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/tel\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=J%2FSUk1fjZbx2kFXkChG0E9uiGIg%3D","ukr":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/ukr\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=TLn8gq5EzrN3hPNyTdpVU%2Fqg9rM%3D","urd":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/urd\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=o8FYLjJwKQzDWPcKiZjt%2FK5mMts%3D","vie":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/vie\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=%2BEugJZMfR1jud9usAWfEpBwUTDU%3D","wel":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/wel\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=qBrpLBtaP7NpJu%2B74ez3%2BnhO53Y%3D","yid":"http:\/\/cdn.cs50.net.s3.amazonaws.com\/2012\/fall\/lectures\/4\/lang\/yid\/week4m.srt?response-cache-control=no-cache&AWSAccessKeyId=AKIAJXVDJ7CBFTKPYYPQ&Expires=1388679679&Signature=MNsdsHO0oAYoPU%2BxYeDgaJEOA0A%3D"},"thumbnail":"http:\/\/cdn.cs50.net\/2012\/fall\/lectures\/4\/week4m.png","streamUrl":"rtmp:\/\/stream.cs50.net\/cfx\/st\/","title":"Week 4","author":"David J. Malan","video":{"240p":{"height":240,"width":426.66665649414,"framerate":29.97,"bitrate":190660,"duration":4052,"path":"2012\/fall\/lectures\/4\/week4m-240p.mp4"},"360p":{"height":360,"width":640,"framerate":29.97,"bitrate":638152,"duration":4052,"path":"2012\/fall\/lectures\/4\/week4m-360p.mp4"},"720p":{"height":720,"width":1280,"framerate":29.97,"bitrate":1626337,"duration":4052,"path":"2012\/fall\/lectures\/4\/week4m-720p.mp4"},"1080p":{"height":1080,"width":1920,"framerate":29.97,"bitrate":2626520,"duration":4052,"path":"2012\/fall\/lectures\/4\/week4m-1080p.mp4"}},"torrents":{"MP3":"http:\/\/torrents.cs50.net\/2012\/fall\/lectures\/4\/week4m.mp3","MP4 (240p)":"http:\/\/torrents.cs50.net\/2012\/fall\/lectures\/4\/week4m-240p.mp4","MP4 (360p)":"http:\/\/torrents.cs50.net\/2012\/fall\/lectures\/4\/week4m-360p.mp4","MP4 (720p)":"http:\/\/torrents.cs50.net\/2012\/fall\/lectures\/4\/week4m-720p.mp4","MP4 (1080p)":"http:\/\/torrents.cs50.net\/2012\/fall\/lectures\/4\/week4m-1080p.mp4"},"videoUrl":"http:\/\/cdn.cs50.net\/"}