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Writing to a file with sed

Consider the following input file: 
one:        1
two:        2
three:      3
four:       4
five:       5
six:        6
seven:      7
eight:      8
nine:       9
ten:       10
eleven:    11
twelve:    12
thirteen:  13
fourteen:  14
fifteen:   15
sixteen:   16
seventeen: 17
eighteen:  18
nineteen:  19
twenty:    20
The following sed script is applied to this input file: 
sed -n '/seven/,/nine/w out' input-file
The out file will then contain: 
seven:      7
eight:      8
nine:       9
seventeen: 17
eighteen:  18
nineteen:  19