/usr/share/racket/pkgs/icons/left-right-mask.xbm is in racket-common 6.3-1.
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 left_right_mask_xbm_width 16
#define left_right_mask_xbm_height 16
static char left_right_mask_xbm_bits[] = {
0xC0, 0x03, 0xC0, 0x03, 0xC0, 0x03, 0xC0, 0x03, 0xD8, 0x1B, 0xDC, 0x3B,
0xFE, 0x7F, 0xFF, 0xFF, 0xFE, 0x7F, 0xDC, 0x3B, 0xD8, 0x1B, 0xC0, 0x03,
0xC0, 0x03, 0xC0, 0x03, 0xC0, 0x03, 0x00, 0x00 };
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