 In the early seventies , the capabilities of AI programs were limited . Even the most impressive could only handle trivial versions of the problems they were supposed to solve ; all the programs were , in some sense , " toys " . AI researchers had begun to run into several fundamental limits that could not be overcome in the 1970s . Although some of these limits would be conquered in later decades , others still stymie the field to this day . 
 In the early seventies , the capabilities of AI programs <a href='uninflect' title='1'><mark>were</mark></a> limited . Even the most impressive could only handle trivial versions of the problems they <a href='uninflect' title='2'><mark>were</mark></a> supposed to solve ; all the programs <a href='uninflect' title='3'><mark>were</mark></a> , in some sense , " toys " . AI researchers <a href='been_done' title='4'><mark>had</mark></a> begun to run into several fundamental limits <a href='null_relcl' title='5'><mark>that</mark></a>could not be overcome in <a href='None' title='6'><mark>the</mark></a><a href='negative_concord' title='7'><mark>1970s</mark></a> . Although some of these limits would be conquered in later decades , others still stymie the field to this day . 
In da early seventies , tdacapabilities of AI programs was limited . Even the most impressive could only handle trivial versions of the problems they was supposed to solve ; alll the programs was , in sum sense , " toys " . AI researchers done begun to run into several fundamental limits could not be overcome in no 1970s . Although ssumof these limits would b conquered in later decades , others still stymie the field to this day .