a b c d
a b c
a b c
b c a
c b a
c a b
b a c
a c b
a b c
a a b
a b c d
d c a b
b c d a
b a d c
b c a d
a d c b
a c b d
a b c
a b c
b c a
c b a
c a b
b a c
a c b
a b c
a a b
a b c d
d c a b
b c d a
b a d c
b c a d
a d c b
a c b d
bad dad cab dac cdab
a b c
b c a
c b a
c a b
b a c
a c b
a b c
a a b
a b c d
d c a b
b c d a
b a d c
b c a d
a d c b
a c b d
a b c
a b c
b c a
c b a
c a b
b a c
a c b
a b c
a a b
a b c d
d c a b
b c d a
b a d c
b c a d
a d c b
a c b d
bad dad cab dac cdab
Last one：所念皆星河（拼音）
Next one：随后写
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