// vec4 is a primitive type@(1,2,3,4) => vec4 a;// declare another@(5,6,7,8) => vec4 b; // add thema + b => vec4 sum;// differencea - b => vec4 diff;// cross product (ignores w component)a * b => vec4 c;  // print sum!<<< "sum:", sum >>>;// print difference<<< "diff:", diff >>>;// print cross product<<< "cross product:", c >>>;  // array[ a, b, c ] @=> vec4 group[]; // print them<<< group[0], group[1], group[2] >>>;