Recoded "con14b" to make invalid units missing, fixes #161
Recoded "con14a" to make invalid units missing, fixes #160
Recoded "con13b" to make invalid units missing, fixes #159
Recoded "con13a" to make invalid units missing, fixes #158
Recoded "con12b" to make invalid units missing, fixes #157
Recoded "con12a" to make invalid units missing, fixes #156
Recoded "con11b" to make invalid units missing, fixes #155
Recoded "con11a" to make invalid units missing, fixes #154
Recoded "con10a" to make invalid units missing, fixes #152
Recoded "con10b" to make invalid units missing, fixes #153