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The combinations page only defines the two constructs:
combinations (( " , " ))
On the combinations pge, the ""N escape sequence expands into the following:
lgcdef lgcname of combinations as "combinations" enddef lgcthen lgcdef lgcname of (( lgcvar , lgcvar )) as "(( ""! , ""! ))" lgcthen lgcend
To perform the expansion, the following constructs are needed:
lgcdef " of " as " enddef lgcname lgcvar lgcthen lgcend
Those constructs are defined on the base page.
lgc(1) expands ""N as follows. First it looks for constructs with the following names:
lgclgcdef " of " as " enddef lgclgcname lgclgcvar lgclgcthen lgclgcend
If found, it uses those constructs. For those construct not found, lgc discards the three first letters of the construct and tries again. Then lgc expands the ""N escape sequence using the constructs found. If lgc finds neither lgclgcname nor lgcname it uses the string "name" instead. For the other constructs, lgc issues an error message.
Note that lgc only tries to discard three letters one time. Thus, lgc is willing to use lgclgcvar and lgcvar but not var for expanding ""N escape sequences.
Note that the option to use one more or one less 'lgc' may be combined with qualification.
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