streets
- cell number table
- column thicket
- stream set row
- coordinates paths city streets
- asphalt chess board too-long fair
- halogen labyrinth playing cards
- row boat row red turnstile coins
- subway memory map
- the problem of sparse matrices
- absence
- not known
- not values
- not join
- not tied
- not said
- empty cells
- blank hole gap
- knot record
- not knot
- forget forgot
- never known
- not filled
- not asked
- erase erasure
- not zero not silence
- a lack of air
- a lack of mark
- missing value(s)
- something stolen
- not revealed not found
- not thought of not dreamed of
- not imagined
- not lost
- not lonely
- not a huge hole in the
- sky