Assertion: zodiac's letter | /r/MadeOf | cryptogram
Facets:
value: along with messages
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: In a 1969 letter to The San Francisco Examiner, the killer identified himself as “Zodiac” for the first time; these letters also often contained cryptograms and ciphers, along with messages that these codes would reveal the killer’s identity to those who managed to decipher them.