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XXX
2xaxa
bxbxb
Saxaxa
8-axa
3x3-xxx
4(axa-3)
axbxb
xxyxx
xxxxyxy
5x2-xxx
axa+bxbxb
2x(1-5xxxx)
Saxa
хух ху
ax4x(6-axa)
3x8-axax7
ax2xax2xa

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