КК
let a = '';
[1,2,3,4,5].forEach((o,о,а)=>о<3&&(a+=
${o}_${а.join(' ')}
));console.log( a );
или
console.log( [1,2,3].map((o)=>o+'_1 2 3 4 5').join(' ') );
Size: a a a
КК
let a = '';
[1,2,3,4,5].forEach((o,о,а)=>о<3&&(a+=
${o}_${а.join(' ')}
));console.log( [1,2,3].map((o)=>o+'_1 2 3 4 5').join(' ') );
КК
D
Δ
D
КК
D
I
D
D
Δ
D
Δ
D
Δ
D
AM
Δ
Δ