merge m:m--not quite as expected

Hi, I have two date sets I'm trying to merge together. Let's say the identifying variable is X. This is how each data set is structured:

master data:

X occupation
aaa 10
aaa 11
aaa 11
aaa 12
aaa 13
bbb 14
ccc 15
ccc 15
ccc 16

using data:
X description
aaa apple
aaa plum
aaa banana
bbb chair
bbb couch
ccc beach

I thought the following command,

merge m:m X using using data

would give me, and this is what I want:

X occupation description
aaa 10 apple
aaa 10 plum
aaa 10 banana
aaa 11 apple
aaa 11 plum
aaa 11 banana
aaa 11 apple
aaa 11 plum
aaa 11 banana
aaa 12 apple
aaa 12 plum
aaa 12 banana
aaa 13 apple
aaa 13 plum
aaa 13 banana
bbb 14 chair
bbb 14 couch
ccc 15 beach
ccc 15 beach
ccc 16 beach


but instead it's giving me:
X occupation description
aaa 10 apple
aaa 11 plum
aaa 11 banana
aaa 12 banana
aaa 13 banana
bbb 14 chair
ccc 15 beach
ccc 15 beach
ccc 16 beach

in which the master data didn't expand at all. Is this how m:m merge is supposed to work? and how would i get the result I want?

Thank you in advance.