AB _I CD
GF II BC
HI _I AB
EF _I BC
EF II IA
HI II CD
FG _I EF
GF _I IA
_I - prostopadłe
II - równoległe
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AB _I CD
GF II BC
HI _I AB
EF _I BC
EF II IA
HI II CD
FG _I EF
GF _I IA
_I - prostopadłe
II - równoległe