184 lines
7.8 KiB
C++
184 lines
7.8 KiB
C++
/*
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* Copyright (C) 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dictionary/header/header_policy.h"
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#include <algorithm>
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#include "utils/ngram_utils.h"
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namespace latinime {
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// Note that these are corresponding definitions in Java side in DictionaryHeader.
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const char *const HeaderPolicy::MULTIPLE_WORDS_DEMOTION_RATE_KEY = "MULTIPLE_WORDS_DEMOTION_RATE";
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const char *const HeaderPolicy::REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY =
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"REQUIRES_GERMAN_UMLAUT_PROCESSING";
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// TODO: Change attribute string to "IS_DECAYING_DICT".
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const char *const HeaderPolicy::IS_DECAYING_DICT_KEY = "USES_FORGETTING_CURVE";
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const char *const HeaderPolicy::DATE_KEY = "date";
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const char *const HeaderPolicy::LAST_DECAYED_TIME_KEY = "LAST_DECAYED_TIME";
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const char *const HeaderPolicy::NGRAM_COUNT_KEYS[] =
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{"UNIGRAM_COUNT", "BIGRAM_COUNT", "TRIGRAM_COUNT", "QUADGRAM_COUNT"};
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const char *const HeaderPolicy::MAX_NGRAM_COUNT_KEYS[] =
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{"MAX_UNIGRAM_ENTRY_COUNT", "MAX_BIGRAM_ENTRY_COUNT", "MAX_TRIGRAM_ENTRY_COUNT",
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"MAX_QUADGRAM_ENTRY_COUNT"};
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const int HeaderPolicy::DEFAULT_MAX_NGRAM_COUNTS[] = {10000, 30000, 30000, 30000};
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const char *const HeaderPolicy::EXTENDED_REGION_SIZE_KEY = "EXTENDED_REGION_SIZE";
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// Historical info is information that is needed to support decaying such as timestamp, level and
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// count.
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const char *const HeaderPolicy::HAS_HISTORICAL_INFO_KEY = "HAS_HISTORICAL_INFO";
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const char *const HeaderPolicy::LOCALE_KEY = "locale"; // match Java declaration
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const char *const HeaderPolicy::FORGETTING_CURVE_PROBABILITY_VALUES_TABLE_ID_KEY =
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"FORGETTING_CURVE_PROBABILITY_VALUES_TABLE_ID";
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const int HeaderPolicy::DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE = 100;
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const float HeaderPolicy::MULTIPLE_WORD_COST_MULTIPLIER_SCALE = 100.0f;
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const int HeaderPolicy::DEFAULT_FORGETTING_CURVE_PROBABILITY_VALUES_TABLE_ID = 3;
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// Used for logging. Question mark is used to indicate that the key is not found.
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void HeaderPolicy::readHeaderValueOrQuestionMark(const char *const key, int *outValue,
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int outValueSize) const {
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if (outValueSize <= 0) return;
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if (outValueSize == 1) {
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outValue[0] = '\0';
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return;
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}
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std::vector<int> keyCodePointVector;
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HeaderReadWriteUtils::insertCharactersIntoVector(key, &keyCodePointVector);
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DictionaryHeaderStructurePolicy::AttributeMap::const_iterator it =
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mAttributeMap.find(keyCodePointVector);
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if (it == mAttributeMap.end()) {
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// The key was not found.
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outValue[0] = '?';
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outValue[1] = '\0';
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return;
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}
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const int terminalIndex = std::min(static_cast<int>(it->second.size()), outValueSize - 1);
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for (int i = 0; i < terminalIndex; ++i) {
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outValue[i] = it->second[i];
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}
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outValue[terminalIndex] = '\0';
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}
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const std::vector<int> HeaderPolicy::readLocale() const {
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return HeaderReadWriteUtils::readCodePointVectorAttributeValue(&mAttributeMap, LOCALE_KEY);
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}
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float HeaderPolicy::readMultipleWordCostMultiplier() const {
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const int demotionRate = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
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MULTIPLE_WORDS_DEMOTION_RATE_KEY, DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE);
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if (demotionRate <= 0) {
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return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
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}
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return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(demotionRate);
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}
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bool HeaderPolicy::readRequiresGermanUmlautProcessing() const {
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return HeaderReadWriteUtils::readBoolAttributeValue(&mAttributeMap,
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REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY, false);
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}
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bool HeaderPolicy::fillInAndWriteHeaderToBuffer(const bool updatesLastDecayedTime,
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const EntryCounts &entryCounts, const int extendedRegionSize,
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BufferWithExtendableBuffer *const outBuffer) const {
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int writingPos = 0;
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DictionaryHeaderStructurePolicy::AttributeMap attributeMapToWrite(mAttributeMap);
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fillInHeader(updatesLastDecayedTime, entryCounts, extendedRegionSize, &attributeMapToWrite);
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if (!HeaderReadWriteUtils::writeDictionaryVersion(outBuffer, mDictFormatVersion,
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&writingPos)) {
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return false;
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}
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if (!HeaderReadWriteUtils::writeDictionaryFlags(outBuffer, mDictionaryFlags,
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&writingPos)) {
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return false;
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}
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// Temporarily writes a placeholder header size.
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int headerSizeFieldPos = writingPos;
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if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(outBuffer, 0 /* size */,
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&writingPos)) {
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return false;
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}
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if (!HeaderReadWriteUtils::writeHeaderAttributes(outBuffer, &attributeMapToWrite,
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&writingPos)) {
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return false;
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}
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// Writes the actual header size.
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if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(outBuffer, writingPos,
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&headerSizeFieldPos)) {
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return false;
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}
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return true;
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}
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namespace {
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int getIndexFromNgramType(const NgramType ngramType) {
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return static_cast<int>(ngramType);
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}
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} // namespace
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void HeaderPolicy::fillInHeader(const bool updatesLastDecayedTime,
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const EntryCounts &entryCounts, const int extendedRegionSize,
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DictionaryHeaderStructurePolicy::AttributeMap *outAttributeMap) const {
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for (const auto ngramType : AllNgramTypes::ASCENDING) {
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HeaderReadWriteUtils::setIntAttribute(outAttributeMap,
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NGRAM_COUNT_KEYS[getIndexFromNgramType(ngramType)],
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entryCounts.getNgramCount(ngramType));
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}
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HeaderReadWriteUtils::setIntAttribute(outAttributeMap, EXTENDED_REGION_SIZE_KEY,
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extendedRegionSize);
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// Set the current time as the generation time.
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HeaderReadWriteUtils::setIntAttribute(outAttributeMap, DATE_KEY,
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TimeKeeper::peekCurrentTime());
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HeaderReadWriteUtils::setCodePointVectorAttribute(outAttributeMap, LOCALE_KEY, mLocale);
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if (updatesLastDecayedTime) {
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// Set current time as the last updated time.
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HeaderReadWriteUtils::setIntAttribute(outAttributeMap, LAST_DECAYED_TIME_KEY,
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TimeKeeper::peekCurrentTime());
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}
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}
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/* static */ DictionaryHeaderStructurePolicy::AttributeMap
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HeaderPolicy::createAttributeMapAndReadAllAttributes(const uint8_t *const dictBuf) {
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DictionaryHeaderStructurePolicy::AttributeMap attributeMap;
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HeaderReadWriteUtils::fetchAllHeaderAttributes(dictBuf, &attributeMap);
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return attributeMap;
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}
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/* static */ const EntryCounts HeaderPolicy::readNgramCounts() const {
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MutableEntryCounters entryCounters;
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for (const auto ngramType : AllNgramTypes::ASCENDING) {
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const int entryCount = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
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NGRAM_COUNT_KEYS[getIndexFromNgramType(ngramType)], 0 /* defaultValue */);
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entryCounters.setNgramCount(ngramType, entryCount);
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}
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return entryCounters.getEntryCounts();
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}
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/* static */ const EntryCounts HeaderPolicy::readMaxNgramCounts() const {
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MutableEntryCounters entryCounters;
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for (const auto ngramType : AllNgramTypes::ASCENDING) {
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const int index = getIndexFromNgramType(ngramType);
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const int maxEntryCount = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
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MAX_NGRAM_COUNT_KEYS[index], DEFAULT_MAX_NGRAM_COUNTS[index]);
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entryCounters.setNgramCount(ngramType, maxEntryCount);
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}
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return entryCounters.getEntryCounts();
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}
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} // namespace latinime
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