sqlldr- combine and insert two values - position(1:10) and position(20:30) into one column

i have to load a text file into oracle table using sqlldr.
I want to load characters from position(1:10) and position(20:30) into one column into my oracle table
I donot want to load characters from 10-20 since they are some invalid charactesr(like carriage returns etc) and it messes up my dataload of characters from position-20:30)
 
How can i do that using sqlldr
I tried
options( SKIP = 0 )
load data
infile 'myfile.txt' "str '\n'"
insert INTO
Table mytable
TRAILING NULLCOLS
 (  
allcols    position(1:10,20:30)  
 )

but that failed, I also tried using || concatenator but it did not work
pl help
at999Asked:
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slightwv (䄆 Netminder) Commented:
use boundfiller.

Here is a working example:

drop table tab1 purge;
create table tab1(col1 varchar2(10));

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OPTIONS ( DIRECT=TRUE)
LOAD DATA
INFILE *
INTO TABLE TAB1
APPEND
FIELDS TERMINATED BY ','
(
part1 boundfiller position(1:3),
part2 boundfiller position(8:12),
col1  ":part1 || :part2"
)
begindata
abcdefghijklmnop

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at999Author Commented:
thanks a lot its working
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