Like Query help

query

select company_code, item_code, item_description, product_line,
udf_item_width, udf_item_length, sales_unit_measure, ''as mat_type from
mas_combined_item_master where company_code='BUR' or company_code='SNJ'
or company_code='EBC' and udf_edb_managed=''
and item_code LIKE 'S-%' order by item_code;

comment

Second column is item_code...why are these items in the results.
Expecting the query to return results where the item_code

starts with "S-" and includes any othervalue past "S-"

results

"SNJ";"000001 1X1 CORNER BULLNOSE";"1x1 Corner Double
Bullnose";"SYZY";"";"";"EACH";""
"SNJ";"0001 BRIGHT WHITE LISTELLO";"Bright White Listello
5/8x12";"VILL";"";"";"EACH";""
"SNJ";"0001 CUSTOM 1X6 BULLNOSE LONG";"Custom 1x6 Bullnose on 6"
Side";"SYZY";"";"";"EACH";""
"BUR";"000936MOD1P4";"Matte Cappuccino Tile";"AMOL";"";"";"SF";""
"SNJ";"000936MOD1P4";"Matte Cappuccino Tile";"AMOL";"";"";"SF";""
"BUR";"0009S4369MOD1P2";"Matte Cappuccino BN on 6"";"AMOL";"";"";"EA";""
"SNJ";"0009S4369MOD1P2";"Matte Cappuccino BN on 6"";"AMOL";"";"";"EA";""
"BUR";"0009S4639MOD1P2";"Matte Cappucino BN on 3"";"AMOL";"";"";"EA";""
"SNJ";"0009S4639MOD1P2";"Matte Cappucino BN on 3"";"AMOL";"";"";"EA";""
"BUR";"0009SCL4369M1P2";"Matte Cappuccino Left
Bullnose";"AMOL";"";"";"EA";""
"SNJ";"0009SCL4369M1P2";"Matte Cappuccino Left
Bullnose";"AMOL";"";"";"EA";""
"BUR";"0009SCR4369M1P2";"Matte Cappuccino Right BN";"AMOL";"";"";"EA";""
"SNJ";"0009SCR4369M1P2";"Matte Cappuccino Right BN";"AMOL";"";"";"EA";""
"SNJ";"0014 SURF 2X4 OFFSET";"Surf 2x4 Offset Mosaic";"VILL";"";"";"EACH";""
"SNJ";"0014 SURF LISTELLO";"Surf Listello 5/8x12";"VILL";"";"";"EACH";""
"SNJ";"0015 ICE 2X4 OFFSET";"Ice 2x4 Offset Mosaic";"VILL";"";"";"EACH";""