common+occurrence
131Commerson's dolphin — Commerson s Dolphin[1] A Commerson s Dolphin in an aquarium …
132Closed circle of suspects — The closed circle of suspects is a common element of detective fiction, and the subgenre that employs it can be referred to as the closed circle mystery.[1][2][3] Less precisely, this subgenre works with the closed circle literary device is… …
