NBLK
case NBLK:
M(NBLK, 'n','f', nf), /* filled */
M(NBLK, 'c','e', ce), /* centered */
M(NBLK, 'D','S', mssnblock), /* start display text */
M(NBLK, 'K','S', mssnblock), /* start keep */
M(NBLK, 'K','F', mssnblock), /* start float keep */
M(NBLK, 'N','S', mssnblock), /* undocumented */
M(NBLK, '(','l', mesnblock),
M(NBLK, '(','q', mesnblock),
M(NBLK, '(','b', mesnblock),
M(NBLK, '(','z', mesnblock),
M(NBLK, '(','c', mesnblock),
M(NBLK, '(','d', mesnblock),
M(NBLK, '(','f', mesnblock),
M(NBLK, '(','x', mesnblock),