How to GREP unique string only?

Hi,
I have a huge import log file and it's too hard to review the full log file to verify all reported errors are ignorable. So I am looking for a way to list the distinct errors.
I had some manual analysis and workarounds to find out the errors however it consumes time and i am sure there are more easier way.
I will attach sample of the log file.
The log file ends with "Job "SYSTEM"."SYS_IMPORT_FULL_01" completed with 3384 error(s) at 11:38:14" which shows that we have 3384 error in the log file
I went through the file and found some errors and did simple word count command
[AMD64] ortissm2@ausodissm01 > cat full_import.log | grep ORA-39151 | wc -l
598
[AMD64] ortissm2@ausodissm01 > cat full_import.log | grep ORA-39111 | wc -l
1054
[AMD64] ortissm2@ausodissm01 > cat full_import.log | grep ORA-31684 | wc -l
1691
but there are 42 Error still missing .. I did the following workaround to prune the ORA-39151 grep ORA-39111 grep ORA-31684 redirecting the output to another file then search with the same for ORA- pattern
cat full_import.log | grep -v -e ORA-39151 -e ORA-39111 -e ORA-31684 >import.log
[AMD64] ortissm2@ausodissm01 > cat import.log | grep ORA-39083 | wc -l
1
[AMD64] ortissm2@ausodissm01 > cat import.log | grep ORA-29357 | wc -l
1
[AMD64] ortissm2@ausodissm01 > cat import.log | grep ORA-39082 | wc -l
40
SAMPLE LOG FILE
--=--
ORA-31684: Object type TABLESPACE:"UNDOTBS1" already exists
ORA-31684: Object type TABLESPACE:"SYSAUX" already exists
ORA-31684: Object type TABLESPACE:"TEMP" already exists
ORA-39111: Dependent object type TRIGGER:"SYSMAN"."SEV_ANNOTATION_INSERT_TR" skipped, base object type VIEW:"SYSMAN"."MGMT_SEVERITY_ANNOTATION" already exists
ORA-39111: Dependent object type TRIGGER:"SYSMAN"."SEV_ANNOTATION_DELETE_TR" skipped, base object type VIEW:"SYSMAN"."MGMT_SEVERITY_ANNOTATION" already exists
ORA-39111: Dependent object type TRIGGER:"SYSMAN"."SPACE_METRICS_PURGE_TRIGGER" skipped, base object type VIEW:"SYSMAN"."MGMT_SPACE_PURGE" already exists
ORA-39151: Table "WKSYS"."WK$_SYSINFO" exists. All dependent metadata and data will be skipped due to table_exists_action of skip
ORA-39151: Table "WKSYS"."WK$_SOURCE_GROUP" exists. All dependent metadata and data will be skipped due to table_exists_action of skip
--=--
Need to grep the unique ORA- error only, the output like hereunder
ORA-31684
ORA-39111
ORA-39151
If we able to amend the code to get the number of occurrence this will be perfect and safe time too
thanks in advance,

Some Oracle errors will be follow up errors and as such not indicate what went wrong, but in terms of extracting these errors, how about a case statement and putting each error type in a separate file, which then allows easy further processing, e.g.:
while read line; do
   case $line in
     *ORA-39151* ) echo $line >> ORA-39151.log ;;
     *ORA-29357* ) echo $line >> ORA-29357.log ;;
   esac
done < /path/$ORACLE_SID_alert.log

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Dear all,
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Hi,
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