P = 0; S = 0;
function f(a,b,c,d,n=24,L='',g='') {
    if (L.match(a+b+c+d)) return 0;
    if (!--n) return S+=6*4;
    L += ' ' + a+b+c+d;
    if (++P % 1e6 == 0) console.log(g, S);
    return f(b,a,c,d,n,L,g+'1') +
           f(a,c,b,d,n,L,g+'2') +
           f(a,b,d,c,n,L,g+'3') +
           f(c,b,a,d,n,L,g+'4') +
           f(a,d,c,b,n,L,g+'5') +
           f(d,b,c,a,n,L,g+'6');
}
f('1','4','2','3',22,'1234 1243','')


P = 0; S = 0;
function f(a,b,c,d,n=24,L='',g='') {
    if (L.match(a+b+c+d)) return 0;
    if (!--n) return S+=6;
    L += ' ' + a+b+c+d;
    if (++P % 1e6 == 0) console.log(g, S);
    return f(b,a,c,d,n,L,g+'1') +
           f(a,c,b,d,n,L,g+'2') +
           f(a,b,d,c,n,L,g+'3') +
           f(c,b,a,d,n,L,g+'4') +
           f(a,d,c,b,n,L,g+'5') +
           f(d,b,c,a,n,L,g+'6');
}
f('2','1','4','3',22,'1234 1243','')