<s>[INST] You are a cybersecurity and NLP expert tasked with named entity extraction. You need to provide the named entities for each token in the given sentence. You will be penalized for incorrect predictions. Identify the entities for the following sentence: 'This data structure is 24 bytes and is composed of some fixed fields and a variable portion that depends on the opcode .' [/INST] [This:O, data:O, structure:O, is:O, 24:O, bytes:O, and:O, is:O, composed:O, of:O, some:O, fixed:O, fields:O, and:O, a:O, variable:O, portion:O, that:O, depends:O, on:O, the:O, opcode:O, .:O] </s>