```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>(t) UA-P/C - COLOR Cholesterol (Gr@10:54:07</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <subquery_constraint>
        <first_query>
            <query_id>Observation B</query_id>
            <join_column>STARTDATE</join_column>
            <aggregate_operator>FIRST</aggregate_operator>
        </first_query>
        <operator>LESS</operator>
        <second_query>
            <query_id>Observation A</query_id>
            <join_column>STARTDATE</join_column>
            <aggregate_operator>FIRST</aggregate_operator>
        </second_query>
    </subquery_constraint>
    <subquery>
        <query_id>Observation B</query_id>
        <query_type>EVENT</query_type>
        <query_name>Observation B</query_name>
        <query_timing>SAMEINSTANCENUM</query_timing>
        <specificity_scale>0</specificity_scale>
        <panel>
            <panel_number>0</panel_number>
            <panel_timing>SAMEINSTANCENUM</panel_timing>
            <panel_accuracy_scale>100</panel_accuracy_scale>
            <invert>0</invert>
            <total_item_occurrences>1</total_item_occurrences>
            <item>
                <hlevel>5</hlevel>
                <item_name>UA-P/C - COLOR (LOINC:5778-6)</item_name>
                <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB48) Urinalysis\(LLB49) Urinalysis\UA-COLOR\LOINC:5778-6\</item_key>
                <item_icon>LA</item_icon>
                <tooltip>Labtests \ Urinalysis \ Urinalysis \ Color (Group:UA-COLOR) \ Ua-p/c - color (LOINC:5778-6)</tooltip>
                <class>ENC</class>
                <constrain_by_value>
                    <value_operator>IN</value_operator>
                    <value_constraint>('AMBER','BROWN','DK-YEL','GREEN','ORANGE','OTHER','RED','STRAW','STRAW CLEAR','STRAW, CLEAR','YELLOW','YELLOW CLEAR','YELLOW CLOUDY','YELLOW HAZY','YELLOW, CLEAR','YELLOW,CLEAR','YELLOW,CLOUDY','YELLOW/CLEAR','YELLOW/HAZY','DK YELL/CLEAR','DK YELL/HZY','DK YELLOW','DK.YELLOW','DK/YELLOW','LT YELL/CLEAR','STRAW/CLEAR','YELL/CLDY','YELL/CLEAR','YELL/CLR','YELL/HZY')</value_constraint>
                    <value_type>TEXT</value_type>
                </constrain_by_value>
                <item_is_synonym>false</item_is_synonym>
            </item>
        </panel>
    </subquery>
    <subquery>
        <query_id>Observation A</query_id>
        <query_type>EVENT</query_type>
        <query_name>Observation A</query_name>
        <query_timing>SAMEINSTANCENUM</query_timing>
        <specificity_scale>0</specificity_scale>
        <panel>
            <panel_number>0</panel_number>
            <panel_timing>SAMEINSTANCENUM</panel_timing>
            <panel_accuracy_scale>100</panel_accuracy_scale>
            <invert>0</invert>
            <total_item_occurrences>1</total_item_occurrences>
            <item>
                <hlevel>4</hlevel>
                <item_name>Cholesterol (Group:CHOL)</item_name>
                <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB16) Chemistry\(LLB17) Lipid Tests\CHOL\</item_key>
                <item_icon>FA</item_icon>
                <tooltip>Labtests \ Chemistry \ Lipid Tests \ Cholesterol (Group:CHOL)</tooltip>
                <class>ENC</class>
                <constrain_by_value>
                    <value_operator>GE</value_operator>
                    <value_constraint>199</value_constraint>
                    <value_unit_of_measure>mg/dl</value_unit_of_measure>
                    <value_type>NUMBER</value_type>
                </constrain_by_value>
                <item_is_synonym>false</item_is_synonym>
            </item>
        </panel>
    </subquery>
</ns4:query_definition>

```

I want to find patients with an observation of UA-P/C - COLOR Cholesterol (Group:UA-COLOR) that occurred less than the first observation of Cholesterol (Group:CHOL) in the same instance number.