The copy is built here with p_LPshiftT with j = 1:
*
https://github.com/Singular/Sources/blob/spielwiese/kernel/GBEngine/kutil.cc#L12294called through
#1 0x00000000101f3ebc in enterOnePairSelfShifts (qq=0x107125b8, p=0x107125b8,
ecart=0, isFromQ=0, strat=0x1071ce08, uptodeg=4, lV=3) at kutil.cc:12305
#2 0x00000000101f4ff4 in initenterpairsShift (h=0x107125b8, k=0, ecart=0,
isFromQ=0, strat=0x1071ce08, atR=3, uptodeg=4, lV=3) at kutil.cc:12678
#3 0x00000000101f4ba0 in enterpairsShift (h=0x107125b8, k=0, ecart=0, pos=1,
strat=0x1071ce08, atR=3, uptodeg=4, lV=3) at kutil.cc:12615
#4 0x00000000101ae69c in bbaShift (F=0x107228a8, Q=0x0, w=0x0, hilb=0x0,
strat=0x1071ce08, uptodeg=4, lV=3) at kstd2.cc:4268