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all: a b c d
a:
sleep 2
b:
sleep 2
c:
sleep 2
d:
sleep 2
$ time make
sleep 2
sleep 2
sleep 2
sleep 2
real 0m8.008s
user 0m0.000s
sys 0m0.003s
$ time make -j2
sleep 2
sleep 2
sleep 2
sleep 2
real 0m4.008s
user 0m0.003s
sys 0m0.000s
$ time make -j4
sleep 2
sleep 2
sleep 2
sleep 2
real 0m2.006s
user 0m0.003s
sys 0m0.003s