For one unicode (1st column), keep only lines having a `kMandarin` value and `kDefinition`, how to do so ?

unihan_input.txt

U+3400	kCantonese	jau1
U+3400	kDefinition	(same as U+4E18 丘) hillock or mound
U+3400	kMandarin	qiū
U+3401	kCantonese	tim2
U+3401	kDefinition	to lick; to taste, a mat, bamboo bark
U+3401	kHanyuPinyin	10019.020:tiàn
U+3401	kMandarin	tiàn
U+3402	kDefinition	(J) non-standard form of U+559C 喜, to like, love, enjoy; a joyful thing
U+3404	kMandarin	kuà
U+3405	kCantonese	ng5
U+3405	kMandarin	wǔ

unihan_output.txt

U+3400	kMandarin	qiū
U+3401	kMandarin	tiàn

Add a condition using grep, for instance:

while read -r unicode field pinyin;
do
 hasDef="$(grep -G 0q "$unicode[[:space:]]kDefinition" ./resources/unihan/Unihan_Readings.txt)"
  if [[ $unicode = U+* && $field = kMandarin && $hasDef ]]; then
    printf '%s;%b;%s\n' \
      "$unicode" \
      "\\u${unicode#U+}" \
      "$pinyin" \
    >> "$outputFile"
  fi
done < "$inputFile"