sentences: skin is a mean of sedimentary stone
docs: sedimentary is rock. animal_skin is skin. sedimentary_clay is soil. parchment is animal_skin. limestone is sedimentary_rock. sandstone is clastic_sedimentary_rock. clastic_sedimentary_rock is sedimentary_rock. slate is sedimentary_rock. sedimentary_rock is rock. sedimentary_rock is stone.