+dnl Known bugs:
+dnl TOTAL interaction with PCOMPUTE, e.g. the following
+dnl CTABLES
+dnl /PCOMPUTE &all_drivers=EXPR([1 THRU 2] + [3 THRU 4])
+dnl /PPROPERTIES &all_drivers LABEL='All Drivers'
+dnl /PCOMPUTE &pct_not_drivers=EXPR([5] / ([1 THRU 2] + [3 THRU 4] + [5]) * 100)
+dnl /PPROPERTIES &pct_not_drivers LABEL='% Not Drivers' FORMAT=COUNT PCT40.1
+dnl /TABLE=qn1 BY qns3a
+dnl /CATEGORIES VARIABLES=qns3a TOTAL=YES
+dnl /CATEGORIES VARIABLES=qn1 [1 THRU 2, SUBTOTAL='Frequent Drivers',
+dnl 3 THRU 4, SUBTOTAL='Infrequent Drivers',
+dnl &all_drivers, 5, &pct_not_drivers,
+dnl MISSING, SUBTOTAL='Not Drivers or Missing'].
+dnl yields gaps in the Total column:
+dnl ╭─────────────────────────────────────────────────────────────────────────┬──────────────────╮
+dnl │ │ S3a. GENDER: │
+dnl │ ├─────┬──────┬─────┤
+dnl │ │ Male│Female│Total│
+dnl │ ├─────┼──────┼─────┤
+dnl │ │Count│ Count│Count│
+dnl ├─────────────────────────────────────────────────────────────────────────┼─────┼──────┼─────┤
+dnl │ 1. How often do you usually drive a car or other Every day │ 2305│ 2362│ 4667│
+dnl │motor vehicle? Several days a week │ 440│ 834│ 1274│
+dnl │ Frequent Drivers │ 2745│ 3196│ │
+dnl │ Once a week or less │ 125│ 236│ 361│
+dnl │ Only certain times a │ 58│ 72│ 130│
+dnl │ year │ │ │ │
+dnl │ Infrequent Drivers │ 183│ 308│ │
+dnl │ All Drivers │ 2928│ 3504│ │
+dnl │ Never │ 192│ 348│ 540│
+dnl │ % Not Drivers │ 6.2%│ 9.0%│ │
+dnl │ Don't know │ 3│ 5│ 8│
+dnl │ Refused │ 9│ 10│ 19│
+dnl │ Not Drivers or │ 204│ 363│ │
+dnl │ Missing │ │ │ │
+dnl ╰─────────────────────────────────────────────────────────────────────────┴─────┴──────┴─────╯
+dnl Features not yet implemented: