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@l = ...;

...
<MIR-1><ASSC-PHRASE-1><VACCVIRUS-PROP-1><PATTERN-1>
<MIR-1><EXP-V-0><ART-0><VACCVIRUS-PROP-1>
<MIR-1><EXP-V-0><ART-0><BE-V><VACCVIRUS-PROP-1>

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$_ !~ m[<EXP-N-\d+>] and print for @l;;
<MIR-1><EXP-V-3><VACCVIRUS-PROP-1>
<MIR-1><ASSC-PHRASE-1><VACCVIRUS-PROP-1><PATTERN-1>
<MIR-1><EXP-V-0><ART-0><VACCVIRUS-PROP-1>
<MIR-1><EXP-V-0><ART-0><BE-V><VACCVIRUS-PROP-1>