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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def multihead_attention_vars( mesh, heads, io_channels, kv_channels, master_dtype, slice_dtype, activation_dtype):
 """Deprecated version of multihead_attention_params with combine=True."""

  return multihead_attention_params(
      mesh, heads, io_channels, kv_channels,
      mtf.VariableDType(master_dtype, slice_dtype, activation_dtype),
      combine=True)