DS37FCWLU4T4LQ2PC2BD23YTXSENIYRTWB7GFS2W3NKJ7VSLXXCAC
K7GMQ3NNZF4Z4RVMTV7FXFDI3NJROAXWNHCH7Y6TYXPFW2Q2C37QC
2GP4MXKEDQMZ7E6TCRSMV2AGN7HLEAHR3QEAC2QFCQQNPMNJSIHQC
7B74AT3BXYB7PVW4F6SGQNPMHOU5TEV5TZ54CG6VSQI46XSEKWXQC
QD3NDIJ4CRDN6QGCHALU2UG5DPMAYGE4MSGJPLYVXKLZNCV2WGIAC
ZCTQJ724XCOD6BTABJD4UWCUIB4JBMOVNLVK2BTK2J6CCNCDJWSAC
c->prev = c->geom;