Prevent ERROR when loading solution.pl

solution.pl

@@ -31,14 +31,14 @@ order as they were supplied to create table/2).
 If the given table does not exist, the predicate must throw a descriptive
 exception (use throw/1).
 */
-cols(Table, Cols).
+/* cols(Table, Cols). */
 
 :- dynamic row/2.
 /*
 Unifies Row, one result at a time, with each row in the given Table.
 If the given table does not exist, the predicate should fail.
 */
-row(Table, Row).
+/* row(Table, Row). */
 
 :- dynamic rows/1.
 /*
@@ -46,7 +46,7 @@ Displays all rows in the given table, one per line (use writeln/1).
 If the given table does not exist, the predicate must throw a descriptive
 exception.
 */
-rows(Table).
+/* rows(Table). */
 
 :- dynamic insert/2.
 /*
@@ -59,7 +59,7 @@ exception.
 If the row does not have as many elements as the number of columns in
 the table, the predicate must throw a descriptive exception.
 */
-insert(Table, Row).
+/* insert(Table, Row). */ 
 
 :- dynamic drop/1.
 /*
@@ -71,7 +71,7 @@ and signature later on.
 If the given table does not exist, the predicate must throw a descriptive
 exception.
 */
-drop(Table).
+/* drop(Table). */ 
 
 :- dynamic delete/1.
 /*
@@ -81,7 +81,7 @@ more rows.
 If the given table does not exist, the predicate must throw a descriptive
 exception.
 */
-delete(Table).
+/* delete(Table). */ 
 
 :- dynamic delete/2.
 /*
@@ -95,7 +95,7 @@ prompt, but which may include selectors. Selectors are terms of the form
 +<column>where <column>should be replaced by a column name.
 (See tests.pl for some concrete usage examples.)
 */
-delete(Table, Conds).
+/* delete(Table, Conds). */ 
 
 :- dynamic selec/4.
 /*
@@ -127,14 +127,14 @@ For example:
 findall(Values, selec(persons,[+id,+first],[],Values), Projections)
 returns: Projections = [[0, "Jeffrey"], [1, "Lorena"], [2, "Joseph"], ...
 */
-selec(Table, Selectors, Conds, Projection).
+/* selec(Table, Selectors, Conds, Projection). */
 
 :- dynamic selec/3.
 /*
 Simplified variant of the selec/4 predicate when there are no conditions
 to be checked.
 */
-selec(TableOrTables, Selectors, Projection).
+/* selec(TableOrTables, Selectors, Projection). */ 
 
 :- dynamic query/2.
 /*
@@ -182,10 +182,10 @@ selec/4 predicate.
 For “INSERT”, nothing needs to be printed by query/1 or in case of
 success, and if query/2 is used the Result parameter can be ignored.
 */
-query(Query, Result).
+/* query(Query, Result). */ 
 
 :- dynamic query/1.
 /*
 cf. query/2
 */
-query(Query).
+/* query(Query). */