# simple example of zigzag filtration
# i: inclusion
# r: removal
# first value: filtration value
# remaining values: if inclusion, boundary of the simplex to include in ascending order,
#                   a number corresponds to the id of the simplex in the boundary
#                   the ids start at 0 and corresponds to their "arrow number"
#                   If removal: id of the simplex to remove + dimension
# #: comment line

i 0. 
i 0. 
i 0. 

i 1. 0 1
i 1. 0 2
i 1. 

i 2. 1 2
i 2. 
i 2. 5 7

i 3. 
i 3. 3 4 6
i 3. 7 9
i 3. 5 9

i 4. 8 11 12

r 5. 10 2

r 6. 13 2
i 6. 1 7
i 6. 3 4 6

i 7. 2 7
i 7. 8 11 12
i 7. 0 7
i 7. 4 18 20
i 7. 6 16 18
i 7. 3 16 20

r 8. 19 2

r 9. 8 1
r 9. 12 1
i 9. 17 21 22 23

r 10. 27 3