ra.writeByte(TEST_DATA.charAt(4));
// restart at pos 4 (but overwrite with different content)
ra.seek(3);
ra.writeByte(TEST_DATA.charAt(7));
ra.writeByte(TEST_DATA.charAt(8));
// advance to pos 11
ra.seek(10);
ra.writeByte(TEST_DATA.charAt(10));
ra.writeByte(TEST_DATA.charAt(11));