x1 (mass) is a mixture/blend/colloid/commingling with ingredients including x2.
x2 mingles/mixes/blends into x1; x2 is in x1, an ingredient/part/component/element of x1 (= selxre for reordered places).
See also salta, te runta, stasu, jicla, sanso.
x1 synthesizes complex concept x2 out of constituent concepts including x3 (jo'u) [less understandable/meaningful in isolation] for purposes of study, using method of synthesis x4.