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buddy system always allocate the memory in the power of 2

50K  ====> 64K

150 K  ====> 256K

90 K  ====> 128 K

130 K  ====> 256 K

70 K  ====> 128 K

80 K  ====> 128 K

remaning you have 64 KB only in 1MB.... Therefore 120K is first rejected due to lack of memory

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