### Logical conjuntion/disjunction #738

lookup slash_backslash {
  ignore sub @NotSpace slash' backslash;
  ignore sub slash' backslash @NotSpace;
  sub slash.spacer backslash' by slash_backslash.liga;
  sub slash' backslash by slash.spacer;
} slash_backslash;

lookup backslash_slash {
  ignore sub @NotSpace backslash' slash;
  ignore sub backslash' slash @NotSpace;
  sub backslash.spacer slash' by backslash_slash.liga;
  sub backslash' slash by backslash.spacer;
} backslash_slash;