 DTI-SNNFRA operates on two stages: first  it uses SNN followed by a partitional clustering for sampling the search space.
<fluency>  DTI-SNNFRA operates on two stages: first  it uses SNN followed by a partitional clustering for sampling the search space.
 DTI-SNNFRA operates on two stages: first it uses SNN followed by a partitioning clustering for sampling the search space.