1 files changed, 9 insertions, 0 deletions
diff --git a/prolog/lexer.py b/prolog/lexer.py
index 7ca67e1..f905a2b 100644
--- a/prolog/lexer.py
+++ b/prolog/lexer.py
@@ -46,6 +46,15 @@ operators = {
     r'@=<': 'LEL',
     r'@>':  'GTL',
     r'@>=': 'GEL',
+    r'#=':  'EQFD',
+    r'#\=': 'NEQFD',
+    r'#<':  'LTFD',
+    r'#=<': 'LEFD',
+    r'#>':  'GTFD',
+    r'#>=': 'GEFD',
+    r'in':  'IN',
+    r'ins': 'INS',
+    r'..':  'THROUGH',
     r'+':   'PLUS',
     r'-':   'MINUS',
     r'*':   'STAR',