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is a pencil a heterogeneous mixture
is pencil lead a heterogeneous mixture
is a pencil a mixture
is pencil lead a homogeneous or heterogeneous
picture of a heterogeneous mixture
heterogeneous mixture with large particles
fun experiments with heterogeneous mixtures
is a pencil a heterogeneous mixture, is pencil lead a heterogeneous mixture, is a pencil a mixture, is pencil lead a homogeneous or heterogeneous, picture of a heterogeneous mixture, heterogeneous mixture with large particles, fun experiments with heterogeneous mixtures
