"parthood" . . "mereology" . "composite objects" . . . . "GEM" . "universal region" . "parts of the system and relationships between these parts" . . "sums" . "Mereology" . . "PartOf" . . . "parts and wholes" . "Mereology#Special composition question (SCQ)" . "mereological atoms" . . "Mereology#SCQ" . "Parthood" . "mereological fusions" . "Composite objects" . . . "discrete mereology" . . . "problem of the one and the many" . . "mereological" . . "Mereology" . "'''mereological'''" . . . "mereological relationship" .