Format             ; Parent Format    ; Comment
XX XXX XXX*        ; fixed_2/3-13
XX XX XX XX XX     ; fixed_2/3-13
XX XXXX XXX*       ; fixed_2/3-13
XX XXX XX X*       ; fixed_2/3-13
XX XXX XXX XX*     ; fixed_2/3-13
XX XX XX X XX XX   ; fixed_2/3-13
XXX XXX XX**       ; fixed_3/3-12
XXX XXXX XXX*      ; fixed_3/3-12
XXX XX XX X*       ; fixed_3/3-12
XXX XX XX XX XX    ; fixed_3/3-12
XXX XXX XX XX      ; fixed_3/3-12
XXX XXX XX XX X    ; fixed_3/3-12
XXX XXX XXX XX*    ; fixed_3/3-12
XXXX XXX X***      ; fixed_4/2-11
XX XX XX XX        ; fixed_4/2-11     ; "Sometimes four-digit area codes are split into two groups of two."
XX XX X XX XX      ; fixed_4/2-11     ; "Sometimes four-digit area codes are split into two groups of two."
XX XX XX XX XX     ; fixed_4/2-11     ; "Sometimes four-digit area codes are split into two groups of two."
XX XX X XX XX XX   ; fixed_4/2-11     ; "Sometimes four-digit area codes are split into two groups of two."
XX XX XX XX XX XX  ; fixed_4/2-11     ; "Sometimes four-digit area codes are split into two groups of two."
XXXX XXXX X***     ; fixed_4/2-11
XXXX XXX XXX XXX   ; fixed_4/2-11
XXXX XX XXX XX     ; fixed_4/2-11
XXXX XXX XX XX     ; fixed_4/2-11
XXXX XX XX XX*     ; fixed_4/2-11
XXXXX XXX XXX*     ; fixed_5/2-10
XXXXX XXXX XXX*    ; fixed_5/2-10
XXXXX XXX XXX XXX  ; fixed_5/2-10
XXXX XX XXX XX     ; mobile_4/7
XXXX XXX XXXX      ; mobile_4/7
XXXX XXXX XXX      ; mobile_4/7
XXX XXXXXXXX       ; mobile_4/7
XXX XXX XXX XX     ; mobile_4/7
XXX XXX XXX X      ; mobile_3/7-8
XXX XX* XXX XX     ; mobile_3/7-8
XXX XXX XXX X      ; mobile_3/7-8
XXX XX* XXX XX     ; tollfree_3/7-12
XXX XXX XXX X      ; tollfree_3/7-12
XXX XXXX XXX       ; tollfree_3/7-12
XXX XXX XX XX*     ; tollfree_3/7-12
XXX XXXXXX XX X*** ; tollfree_3/7-12
900 X XXX XXX*     ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers."
900 X XXXX XXX*    ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers."
180 X XXX XXX      ; varcost_3/1/4-10
180X XXXX**        ; varcost_3/1/4-10 ; "Medium rate numbers often have the first group with four digits (180X)"
180X XX XX XX      ; varcost_3/1/4-10
900X XXXX******    ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers."