U12ttsndsplitAtNXSU22ttXU32ttNU42ttheadafterNthNXSU52ttYU63ttU64splitAtNXSU64pairYSZSpairconsXZSU72ttXSU82ttfstsplitAtNXSU11ttU12ttU21ttU22ttU31ttU32ttU41ttU42ttU51ttU52ttU61ttU62ttU62ttU63ttU71ttU72ttU81ttU82ttafterNthNXSU11ttfstpairXYU21ttheadconsNU31ttnatsFromNconsNselNXSU41ttsndpairXYU51ttsplitAt0XSpairnilXSsplitAtsNconsXU61tttailconsNU71tttakeNXSU81tt2.1U12ttU12ttsndsplitAtNXSsndsplitAtU12ttXSNU12ttsndsplitAtXSttt21.14if standard then (var | con | (lpo || unfold[1] || (dp;(tdg | sccs | sc)*;(edg[2] | sccs | sc | sct | {ur?;lpo -dp -af[2]}restore | {ur?;matrix -dp -dim 2 -ib 2 -ob 2 -ur[2]}restore | uncurryx?;uncurryx -top )[10]*)!)) else if relative then (trivial | var | (unfold[2] || (( lpo -quasi | matrix -dim 2 -ib 2 -ob 3 | matrix -dim 3 -ib 2 -ob 2 | uncurryx )[10]*))) else fail