comb.js

var numbers = ["13", "01", "02", "24", "14", "12", "25"].map(x=>[].slice.call(x)).map(x=>x.concat(x.slice().reverse())).map(x=>x.join("")).map(x=>[x.substr(0,2),x.substr(-2)]);

var perm = function(arr){

    if (arr.length===1){
        return [arr];
    }
    
    var results = [];

    for(var i = 0;i<arr.length;i++){
        var rest = arr.slice();
        var d = rest.splice(i,1);
        perm(rest).map(x=>d.concat(x)).forEach(b=>results.push(b));
    }
    
    return results;
};

var comb = function(arr){

    var results = [];
        
    for(var k = 0;k<128;k++){
        var r = arr.map((x,i)=> x[(k>>i)&1]);
        results.push(r);
    }
    return results;
};

var a = perm(numbers).map(x=>comb(x)).reduce((a,c)=>a.concat(c));