|  |  5.1.1 align 
Syntax:align (vector_expression, int_expression)
 align (module_expression, int_expression)Type:type of the first argument
Purpose:maps module generators gen(i)togen(i+s)for all i.Example:|  |   ring r=0,(x,y,z),(c,dp);
  align([1,2,3],3);
==> [0,0,0,1,2,3]
  align([0,0,1,2,3],-1);
==> [0,1,2,3]
  align(freemodule(2),1);
==> _[1]=[0,1]
==> _[2]=[0,0,1]
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