The address is in column 4. There is a 19 4th avenue, but no 19a. Perhaps they were missed off.
4e it french for 4th
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Many thanks.
In Lovell's 1921/22 there is a alphabetical directory and a street directory. In the street directory for 4th Avenue there is at No. 17 W H Warren, 17a Geo Paquette, 19 Ed Grant, 19a Mrs A Halliday widow, 21 Charles Cox, 21a John Macleod.
In the 1921 Census all the names and addresses appear other than Alexandra Halliday at 19a!
I feel she was there but as suggested was missed in the census.
Colin