$(filter-out <pattern...>,<text>)
objs = hello.c world.c are.c you.c ok.c
new = hello.c world.c are.c you.c ok.c add.c
all:
@echo $(filter-out $(new), $(objs))
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
$(filter-out $(cmd_$@), $(cmd_$(1))) )
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