历练 歷練
Stroke order
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Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
历
These are the forms of 歷, the traditional character: 历 is a twentieth-century simplification, found in no ancient corpus.
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Oracle bone script 商 -
Clerical script 孫吳 - See all 7 forms
练
These are the forms of 練, the traditional character: 练 is a twentieth-century simplification, found in no ancient corpus.
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Chu manuscripts 戰國.楚 -
Clerical script 東漢 - See all 8 forms
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).