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    var a1=[1,2,3,4];
    var a2=[[1],[2]];
    
    function checkArrayOfArrays(a){
        return a.every(function(x){ return Array.isArray(x); });
    }
    
    console.log(checkArrayOfArrays(a1));
    console.log(checkArrayOfArrays(a2));
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anonymouspro
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