assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {

        assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {

        assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {

			delete(c, subSys)
			return nil
		}
		return err
	}

	ck, ok := c[subSys][tgt]
	if !ok {
		return Error[ErrConfigNotFound]("sub-system %s:%s already deleted or does not exist", subSys, tgt)
	}

	if len(inputs) == 2 {
		currKVS := ck.Clone()
		defKVS := DefaultKVS[subSys]
		for delKey := range strings.FieldsSeq(inputs[1]) {
			_, ok := currKVS.Lookup(delKey)

          "\u7f51\u7edc.Cn", // "网络.Cn"
          "co.uk",
          "co.uk.", // Trailing dot
          "co\uFF61uk", // Alternate dot character
          "com",
          "gov.ck",
          "org.ck",
          "org.mK",
          "us",
          // keep-sorted end
          "j\u00f8rpeland.no", // "jorpeland.no" (first o slashed)
          "xn--jrpeland-54a.no" // IDNA (punycode) encoding of above

          "\u7f51\u7edc.Cn", // "网络.Cn"
          "co.uk",
          "co.uk.", // Trailing dot
          "co\uFF61uk", // Alternate dot character
          "com",
          "gov.ck",
          "org.ck",
          "org.mK",
          "us",
          // keep-sorted end
          "j\u00f8rpeland.no", // "jorpeland.no" (first o slashed)
          "xn--jrpeland-54a.no" // IDNA (punycode) encoding of above

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