/**
 * Performs matrix multiplication of 3x3 matrices
 * r = a * b
 * @param {number[]|Float32Array} r result matrix
 * @param {number[]|Float32Array} a first matrix
 * @param {number[]|Float32Array} b second matrix
 */
export function m3_multiply(r: number[] | Float32Array, a: number[] | Float32Array, b: number[] | Float32Array): void;
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