CLEFT_CONTIG
#define CBOTH_CONTIG (CLEFT_CONTIG | CRIGHT_CONTIG)
state |= CLEFT_CONTIG;
switch (state & (CLEFT_CONTIG | CRIGHT_CONTIG | CHOLE)) {
case CLEFT_CONTIG | CRIGHT_CONTIG:
case CLEFT_CONTIG: