Recoded "cbc6c" to make invalid units missing, fixes #130
Recoded "cbc6b" to make invalid units missing, fixes #129
Recoded "cbc6a" to make invalid units missing, fixes #128
Recoded "cbc5c" to make invalid units missing, fixes #127
Recoded "cbc5b" to make invalid units missing, fixes #126
Recoded "cbc5a" to make invalid units missing, fixes #125
Recoded "cbc4c" to make invalid units missing, fixes #124
Recoded "cbc4b" to make invalid units missing, fixes #123
Recoded "cbc4a" to make invalid units missing, fixes #122