code: package org.optsol.project_scheduling.utils;
  
  import com.fasterxml.jackson.annotation.JsonAutoDetect;
  import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
  import lombok.NoArgsConstructor;
  
  @NoArgsConstructor
  @JsonAutoDetect(
      fieldVisibility = Visibility.NONE,
      setterVisibility = Visibility.NONE,
      getterVisibility = Visibility.NONE,
      isGetterVisibility = Visibility.NONE,
      creatorVisibility = Visibility.NONE
  )
  public class Precedence extends ImmutableIntPair {
  
    public Precedence(int i, int j) {
      super(i, j);
    }
  
    public int get_i() {
      return super.getFirst();
    }
  
    public int get_j() {
      return super.getSecond();
    }
  
  }
  