Appending more than one color to an array loop of colors

[debxyz]

Getting an error message with this "The operator & is undefined for the argument type(s) int, boolean.

Also in first line:

@paulgoux

for (int k = 0; k < cells.length*2; k++) {

If I am understanding correctly, doesn’t that double the array length? Whereas I just want to add 2 colors…