src/main/java/build/buildfarm/instance/memory/MemoryInstance.java [993:1032]:
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    if (!pageToken.isEmpty()) {
      try {
        token = OperationIteratorToken.parseFrom(BaseEncoding.base64().decode(pageToken));
      } catch (InvalidProtocolBufferException e) {
        throw new IllegalArgumentException();
      }
      boolean paged = false;
      while (iter.hasNext() && !paged) {
        paged = iter.next().getName().equals(token.getOperationName());
      }
    } else {
      token = null;
    }
    return new TokenizableIterator<Operation>() {
      private OperationIteratorToken nextToken = token;

      @Override
      public boolean hasNext() {
        return iter.hasNext();
      }

      @Override
      public Operation next() {
        Operation operation = iter.next();
        nextToken =
            OperationIteratorToken.newBuilder().setOperationName(operation.getName()).build();
        return operation;
      }

      @Override
      public String toNextPageToken() {
        if (hasNext()) {
          return BaseEncoding.base64().encode(nextToken.toByteArray());
        }
        return "";
      }
    };
  }

  @Override
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src/main/java/build/buildfarm/instance/shard/ShardInstance.java [2341:2380]:
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    if (!pageToken.isEmpty()) {
      try {
        token = OperationIteratorToken.parseFrom(BaseEncoding.base64().decode(pageToken));
      } catch (InvalidProtocolBufferException e) {
        throw new IllegalArgumentException();
      }
      boolean paged = false;
      while (iter.hasNext() && !paged) {
        paged = iter.next().getName().equals(token.getOperationName());
      }
    } else {
      token = null;
    }
    return new TokenizableIterator<Operation>() {
      private OperationIteratorToken nextToken = token;

      @Override
      public boolean hasNext() {
        return iter.hasNext();
      }

      @Override
      public Operation next() {
        Operation operation = iter.next();
        nextToken =
            OperationIteratorToken.newBuilder().setOperationName(operation.getName()).build();
        return operation;
      }

      @Override
      public String toNextPageToken() {
        if (hasNext()) {
          return BaseEncoding.base64().encode(nextToken.toByteArray());
        }
        return "";
      }
    };
  }

  @Override
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