= Amino acid composition
The <amino acid composition> lists amounts or proportions of the different <amino acid residues> in a <protein> or specified <polypeptide chain>, without giving their order. The toy MAGAMG and MMAAGG each have counts M:2, A:2, G:2, or a proportion $1/3$ of each. Knowing composition therefore does not supply <protein primary structure>. Sanger's account begins by distinguishing the already available composition measurements from the largely unknown residue order. See https://garfield.library.upenn.edu/classics1985/A1985ADE5900002.pdf[Sanger's authored 1985 account of the move from composition to terminal-residue analysis].
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