/usr/include/X11/bitmaps/2x2 is in xbitmaps 1.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #define 2x2_width 16
#define 2x2_height 16
static char 2x2_bits[] = {
0xff, 0xff, 0xff, 0xff, 0x33, 0x33, 0x33, 0x33, 0xff, 0xff, 0xff, 0xff,
0x33, 0x33, 0x33, 0x33, 0xff, 0xff, 0xff, 0xff, 0x33, 0x33, 0x33, 0x33,
0xff, 0xff, 0xff, 0xff, 0x33, 0x33, 0x33, 0x33};
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