Marker is a type of Artifact. Marker is related to Sign. you are likely to find Sign in/at/on City. you are likely to find Stranger in/at/on City. 
Flexible is related to Neck. Neck is related to Spine. Spine is a type of Process. Execution is a type of Process. 
Artifact <--IsA-- Marker <--RelatedTo--> Sign --AtLocation--> City <--AtLocation-- Stranger 
Flexible <--RelatedTo--> Neck <--RelatedTo--> Spine --IsA--> Process <--IsA-- Execution 