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arbitrary
autonomous
discretional
discretionary
elective
free
free will
gratuitous
independent
inessential
needless
nonessential
nonmandatory
offered
optional
proffered
self-acting
self-active
self-determined
self-determining
spontaneous
unasked
unbesought
unbidden
uncalled-for
uncoerced
uncompelled
unessential
unforced
uninfluenced
uninvited
unnecessary
unneeded
unpressured
unprompted
unrequested
unsolicited
unsought
voluntary
volunteer
willful
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