UNDIRECTED

igraph_neighbors()
undirected; ALL; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 )
  5: ( )
  6: ( )
undirected; ALL; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 )
  5: ( )
  6: ( 6 6 )
undirected; ALL; LOOPS_TWICE; MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 4 4 )
  5: ( )
  6: ( 6 6 6 6 )

igraph_adjlist_init()
undirected; ALL; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 )
  5: ( )
  6: ( )
undirected; ALL; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 )
  5: ( )
  6: ( 6 6 )
undirected; ALL; LOOPS_TWICE; MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 4 4 )
  5: ( )
  6: ( 6 6 6 6 )

igraph_incident()
undirected; ALL; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 )
  5: ( )
  6: ( )
undirected; ALL; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 8 0 )
  5: ( )
  6: ( 12 11 )
undirected; ALL; LOOPS_TWICE; 
  0: ( 2 1 )
  1: ( 10 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 8 0 8 0 )
  5: ( )
  6: ( 12 11 12 11 )

igraph_inclist_init()
undirected; ALL; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 )
  5: ( )
  6: ( )
undirected; ALL; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 8 0 )
  5: ( )
  6: ( 12 11 )
undirected; ALL; LOOPS_TWICE; 
  0: ( 2 1 )
  1: ( 10 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 9 7 3 6 )
  4: ( 4 5 6 8 0 8 0 )
  5: ( )
  6: ( 12 11 12 11 )

DIRECTED ALL

igraph_neighbors()
directed;   ALL; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 )
  5: ( )
  6: ( )
directed;   ALL; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 )
  5: ( )
  6: ( 6 6 )
directed;   ALL; LOOPS_TWICE; MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 4 4 )
  5: ( )
  6: ( 6 6 6 6 )

igraph_adjlist_init()
directed;   ALL; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 )
  5: ( )
  6: ( )
directed;   ALL; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 )
  5: ( )
  6: ( 6 6 )
directed;   ALL; LOOPS_TWICE; MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 1 4 )
  2: ( 3 3 3 4 )
  3: ( 0 0 2 2 2 4 )
  4: ( 1 2 3 4 4 4 4 )
  5: ( )
  6: ( 6 6 6 6 )

igraph_incident()
directed;   ALL; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 )
  5: ( )
  6: ( )
directed;   ALL; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 8 0 )
  5: ( )
  6: ( 12 11 )
directed;   ALL; LOOPS_TWICE; 
  0: ( 2 1 )
  1: ( 10 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 8 8 0 0 )
  5: ( )
  6: ( 12 12 11 11 )

igraph_inclist_init()
directed;   ALL; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 )
  5: ( )
  6: ( )
directed;   ALL; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 8 0 )
  5: ( )
  6: ( 12 11 )
directed;   ALL; LOOPS_TWICE; 
  0: ( 2 1 )
  1: ( 10 10 4 )
  2: ( 9 7 3 5 )
  3: ( 2 1 7 9 3 6 )
  4: ( 4 5 6 8 8 0 0 )
  5: ( )
  6: ( 12 12 11 11 )

DIRECTED OUT

igraph_neighbors()
directed;   OUT; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 4 )
  3: ( 2 4 )
  4: ( )
  5: ( )
  6: ( )
directed;   OUT; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 4 )
  3: ( 2 4 )
  4: ( 4 4 )
  5: ( )
  6: ( 6 6 )

igraph_adjlist_init()
directed;   OUT; NO_LOOPS;    MULTIPLE;    
  0: ( 3 3 )
  1: ( 4 )
  2: ( 3 3 4 )
  3: ( 2 4 )
  4: ( )
  5: ( )
  6: ( )
directed;   OUT; LOOPS_ONCE;  MULTIPLE;    
  0: ( 3 3 )
  1: ( 1 4 )
  2: ( 3 3 4 )
  3: ( 2 4 )
  4: ( 4 4 )
  5: ( )
  6: ( 6 6 )

igraph_incident()
directed;   OUT; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 3 5 )
  3: ( 7 6 )
  4: ( )
  5: ( )
  6: ( )
directed;   OUT; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 3 5 )
  3: ( 7 6 )
  4: ( 8 0 )
  5: ( )
  6: ( 12 11 )

igraph_inclist_init()
directed;   OUT; NO_LOOPS;    
  0: ( 2 1 )
  1: ( 4 )
  2: ( 9 3 5 )
  3: ( 7 6 )
  4: ( )
  5: ( )
  6: ( )
directed;   OUT; LOOPS_ONCE;  
  0: ( 2 1 )
  1: ( 10 4 )
  2: ( 9 3 5 )
  3: ( 7 6 )
  4: ( 8 0 )
  5: ( )
  6: ( 12 11 )