relationship between items in a set

RANKING
List of words for the clue relationship between items in a set from the crossword:
ADS CDS KEYS OPEN SKIS TEN SETS TREES ZERO STEPS CUE TRUST ALIGN IRONS SYNC RIFT HAND ARGO ASEA
WordClue
KNEEjoint between the thigh and lower leg
LAWNopen space between woods
SKIPinterval, between
GROUPset, collection
TONGSkitchenware used for picking up items
LADDERvertical set of rungs or steps
OUTFITset of clothing
SYSTEMset up
FRACTALmathematical set
LICENSEset of permissions to use something
PROGRAMset of structured activities
RAPPORTclose and harmonious relationship
SORTINGto make a set of objects ordered
MOVEMENTbetween points in space
SHOWCASEset-out, window
ALIGNMENTarrangement of items in a line
REFERENCErelationship or relation
SITUATIONset up
COLLECTIONset
INTERMISSIONrecess between parts of a performance
DEALINGSRelations with others
REFERENCErelationship or relation