public Builder mergeFrom(com.google.cloud.texttospeech.v1beta1.MultiSpeakerMarkup other) {
      if (other == com.google.cloud.texttospeech.v1beta1.MultiSpeakerMarkup.getDefaultInstance())
        return this;
      if (turnsBuilder_ == null) {
        if (!other.turns_.isEmpty()) {
          if (turns_.isEmpty()) {
            turns_ = other.turns_;
            bitField0_ = (bitField0_ & ~0x00000001);
          } else {
            ensureTurnsIsMutable();
            turns_.addAll(other.turns_);
          }
          onChanged();
        }
      } else {
        if (!other.turns_.isEmpty()) {
          if (turnsBuilder_.isEmpty()) {
            turnsBuilder_.dispose();
            turnsBuilder_ = null;
            turns_ = other.turns_;
            bitField0_ = (bitField0_ & ~0x00000001);
            turnsBuilder_ =
                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                    ? getTurnsFieldBuilder()
                    : null;
          } else {
            turnsBuilder_.addAllMessages(other.turns_);
          }
        }
      }
      this.mergeUnknownFields(other.getUnknownFields());
      onChanged();
      return this;
    }
<pre>
A collection of turns for multi-speaker synthesis.
</pre>

Protobuf type {@code google.cloud.texttospeech.v1beta1.MultiSpeakerMarkup}
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/MultiSpeakerMarkup.java