#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;

#define MOD 1000000007
vector<pair<int, int>> built_in = 
{
{ 0, 1},
{ 1, 1}, 
{ 1000001, 5614648}, 
{ 2000001, 208001982}, 
{ 3000001, 692709757}, 
{ 4000001, 819826874}, 
{ 5000001, 179975082}, 
{ 6000001, 564939602}, 
{ 7000001, 224304330}, 
{ 8000001, 829291584}, 
{ 9000001, 301494702}, 
{ 10000001, 924724006}, 
{ 11000001, 372257555}, 
{ 12000001, 299877928}, 
{ 13000001, 730186003}, 
{ 14000001, 324933863}, 
{ 15000001, 965940468}, 
{ 16000001, 154421937}, 
{ 17000001, 759144014}, 
{ 18000001, 979558839}, 
{ 19000001, 166427196}, 
{ 20000001, 582347126}, 
{ 21000001, 159276683}, 
{ 22000001, 88639941}, 
{ 23000001, 544148531}, 
{ 24000001, 976806214}, 
{ 25000001, 233739301}, 
{ 26000001, 358364726}, 
{ 27000001, 657096124}, 
{ 28000001, 739619018}, 
{ 29000001, 721848529}, 
{ 30000001, 500419162}, 
{ 31000001, 766941211}, 
{ 32000001, 589599772}, 
{ 33000001, 769560345}, 
{ 34000001, 373835714}, 
{ 35000001, 35204778}, 
{ 36000001, 258968740}, 
{ 37000001, 964557256}, 
{ 38000001, 346442158}, 
{ 39000001, 616287645}, 
{ 40000001, 881147799}, 
{ 41000001, 9606444}, 
{ 42000001, 817729301}, 
{ 43000001, 95060835}, 
{ 44000001, 691934419}, 
{ 45000001, 253386772}, 
{ 46000001, 26318521}, 
{ 47000001, 149891086}, 
{ 48000001, 3606179}, 
{ 49000001, 228670281}, 
{ 50000001, 693776109}, 
{ 51000001, 176878679}, 
{ 52000001, 576940423}, 
{ 53000001, 359172522}, 
{ 54000001, 966026401}, 
{ 55000001, 955747701}, 
{ 56000001, 55587507}, 
{ 57000001, 421668610}, 
{ 58000001, 304130410}, 
{ 59000001, 19140052}, 
{ 60000001, 435873621}, 
{ 61000001, 121186966}, 
{ 62000001, 25659746}, 
{ 63000001, 150339841}, 
{ 64000001, 270940457}, 
{ 65000001, 350445658}, 
{ 66000001, 56595903}, 
{ 67000001, 449457638}, 
{ 68000001, 654653353}, 
{ 69000001, 135943165}, 
{ 70000001, 279027658}, 
{ 71000001, 6806089}, 
{ 72000001, 768972550}, 
{ 73000001, 501509977}, 
{ 74000001, 64084446}, 
{ 75000001, 300793083}, 
{ 76000001, 557316278}, 
{ 77000001, 558625006}, 
{ 78000001, 726195312}, 
{ 79000001, 786241736}, 
{ 80000001, 727951124}, 
{ 81000001, 836107508}, 
{ 82000001, 826948451}, 
{ 83000001, 475924281}, 
{ 84000001, 577185544}, 
{ 85000001, 86469187}, 
{ 86000001, 147012461}, 
{ 87000001, 391595794}, 
{ 88000001, 385330367}, 
{ 89000001, 131919894}, 
{ 90000001, 398578768}, 
{ 91000001, 304170372}, 
{ 92000001, 922211842}, 
{ 93000001, 881875046}, 
{ 94000001, 715408882}, 
{ 95000001, 756254931}, 
{ 96000001, 682468105}, 
{ 97000001, 2486683}, 
{ 98000001, 121032015}, 
{ 99000001, 370075313}, 
{ 100000001, 678364145}, 
{ 101000001, 75755289}, 
{ 102000001, 205356809}, 
{ 103000001, 929717097}, 
{ 104000001, 402299519}, 
{ 105000001, 214746065}, 
{ 106000001, 321591977}, 
{ 107000001, 206893887}, 
{ 108000001, 567565935}, 
{ 109000001, 909790222}, 
{ 110000001, 204828554}, 
{ 111000001, 781417489}, 
{ 112000001, 565609426}, 
{ 113000001, 356449994}, 
{ 114000001, 630875596}, 
{ 115000001, 230249800}, 
{ 116000001, 351255605}, 
{ 117000001, 535168999}, 
{ 118000001, 181399344}, 
{ 119000001, 958758149}, 
{ 120000001, 345795998}, 
{ 121000001, 417055393}, 
{ 122000001, 780557789}, 
{ 123000001, 738507785}, 
{ 124000001, 911816508}, 
{ 125000001, 491885103}, 
{ 126000001, 216908213}, 
{ 127000001, 691506262}, 
{ 128000001, 574128088}, 
{ 129000001, 568325161}, 
{ 130000001, 116118093}, 
{ 131000001, 703818301}, 
{ 132000001, 846488984}, 
{ 133000001, 188277720}, 
{ 134000001, 971723141}, 
{ 135000001, 478881653}, 
{ 136000001, 747002821}, 
{ 137000001, 737069565}, 
{ 138000001, 625424874}, 
{ 139000001, 873960350}, 
{ 140000001, 359401113}, 
{ 141000001, 72255055}, 
{ 142000001, 860928000}, 
{ 143000001, 758143746}, 
{ 144000001, 119343162}, 
{ 145000001, 196516201}, 
{ 146000001, 718705964}, 
{ 147000001, 647920833}, 
{ 148000001, 259943851}, 
{ 149000001, 414100127}, 
{ 150000001, 236930793}, 
{ 151000001, 732606485}, 
{ 152000001, 155314298}, 
{ 153000001, 825915852}, 
{ 154000001, 879360913}, 
{ 155000001, 213965925}, 
{ 156000001, 344572857}, 
{ 157000001, 591566652}, 
{ 158000001, 375511144}, 
{ 159000001, 508509581}, 
{ 160000001, 856493327}, 
{ 161000001, 807746594}, 
{ 162000001, 834643710}, 
{ 163000001, 833851217}, 
{ 164000001, 540485110}, 
{ 165000001, 116090093}, 
{ 166000001, 397937762}, 
{ 167000001, 621363890}, 
{ 168000001, 984722836}, 
{ 169000001, 861975384}, 
{ 170000001, 207383191}, 
{ 171000001, 391473474}, 
{ 172000001, 8160762}, 
{ 173000001, 744504245}, 
{ 174000001, 867797811}, 
{ 175000001, 548349502}, 
{ 176000001, 340630442}, 
{ 177000001, 287166912}, 
{ 178000001, 985166878}, 
{ 179000001, 411230108}, 
{ 180000001, 617606889}, 
{ 181000001, 274801334}, 
{ 182000001, 132095411}, 
{ 183000001, 702209449}, 
{ 184000001, 298674444}, 
{ 185000001, 211143815}, 
{ 186000001, 913049410}, 
{ 187000001, 83938986}, 
{ 188000001, 307453041}, 
{ 189000001, 614486415}, 
{ 190000001, 933753281}, 
{ 191000001, 26543999}, 
{ 192000001, 915682368}, 
{ 193000001, 115235049}, 
{ 194000001, 291809269}, 
{ 195000001, 107393333}, 
{ 196000001, 258863167}, 
{ 197000001, 292057463}, 
{ 198000001, 314580174}, 
{ 199000001, 906446509}, 
{ 200000001, 26701748}, 
{ 201000001, 199138044}, 
{ 202000001, 263065768}, 
{ 203000001, 854712526}, 
{ 204000001, 893474909}, 
{ 205000001, 458541645}, 
{ 206000001, 790763153}, 
{ 207000001, 177412352}, 
{ 208000001, 690130678}, 
{ 209000001, 238606822}, 
{ 210000001, 329394893}, 
{ 211000001, 709238020}, 
{ 212000001, 156765891}, 
{ 213000001, 691397537}, 
{ 214000001, 134674617}, 
{ 215000001, 486932244}, 
{ 216000001, 715974523}, 
{ 217000001, 159248979}, 
{ 218000001, 594863167}, 
{ 219000001, 269311835}, 
{ 220000001, 360779992}, 
{ 221000001, 941730537}, 
{ 222000001, 49710412}, 
{ 223000001, 4720998}, 
{ 224000001, 710165010}, 
{ 225000001, 82937316}, 
{ 226000001, 965828879}, 
{ 227000001, 309643766}, 
{ 228000001, 334707855}, 
{ 229000001, 818800869}, 
{ 230000001, 416008308}, 
{ 231000001, 637774725}, 
{ 232000001, 367978403}, 
{ 233000001, 433149091}, 
{ 234000001, 426700127}, 
{ 235000001, 844816460}, 
{ 236000001, 217940862}, 
{ 237000001, 252986092}, 
{ 238000001, 939120076}, 
{ 239000001, 561849995}, 
{ 240000001, 187501984}, 
{ 241000001, 948036669}, 
{ 242000001, 130753612}, 
{ 243000001, 752387419}, 
{ 244000001, 599659}, 
{ 245000001, 771197527}, 
{ 246000001, 640886967}, 
{ 247000001, 621980698}, 
{ 248000001, 253212669}, 
{ 249000001, 562814284}, 
{ 250000001, 165706817}, 
{ 251000001, 322131396}, 
{ 252000001, 201264538}, 
{ 253000001, 147301796}, 
{ 254000001, 611896552}, 
{ 255000001, 443716239}, 
{ 256000001, 458216762}, 
{ 257000001, 250575124}, 
{ 258000001, 649656447}, 
{ 259000001, 455035577}, 
{ 260000001, 328891607}, 
{ 261000001, 845327573}, 
{ 262000001, 929065410}, 
{ 263000001, 860412822}, 
{ 264000001, 892368025}, 
{ 265000001, 139554063}, 
{ 266000001, 72049990}, 
{ 267000001, 363852031}, 
{ 268000001, 591031407}, 
{ 269000001, 462584264}, 
{ 270000001, 16385287}, 
{ 271000001, 60044725}, 
{ 272000001, 160515639}, 
{ 273000001, 324276557}, 
{ 274000001, 368372171}, 
{ 275000001, 553609389}, 
{ 276000001, 30546939}, 
{ 277000001, 73102931}, 
{ 278000001, 48856450}, 
{ 279000001, 924477109}, 
{ 280000001, 117411011}, 
{ 281000001, 759429344}, 
{ 282000001, 203771396}, 
{ 283000001, 617555672}, 
{ 284000001, 684972093}, 
{ 285000001, 770307789}, 
{ 286000001, 342380290}, 
{ 287000001, 180898760}, 
{ 288000001, 612624778}, 
{ 289000001, 528730541}, 
{ 290000001, 404196042}, 
{ 291000001, 710012554}, 
{ 292000001, 511229292}, 
{ 293000001, 977984170}, 
{ 294000001, 420925074}, 
{ 295000001, 596598678}, 
{ 296000001, 425362301}, 
{ 297000001, 795961803}, 
{ 298000001, 191008264}, 
{ 299000001, 968913323}, 
{ 300000001, 765064133}, 
{ 301000001, 54831613}, 
{ 302000001, 279760259}, 
{ 303000001, 453492735}, 
{ 304000001, 166551016}, 
{ 305000001, 390504408}, 
{ 306000001, 434664677}, 
{ 307000001, 156255424}, 
{ 308000001, 704263144}, 
{ 309000001, 67426771}, 
{ 310000001, 239669664}, 
{ 311000001, 687922230}, 
{ 312000001, 309780005}, 
{ 313000001, 757891666}, 
{ 314000001, 181811730}, 
{ 315000001, 15662891}, 
{ 316000001, 458873573}, 
{ 317000001, 93971059}, 
{ 318000001, 471459820}, 
{ 319000001, 106760939}, 
{ 320000001, 761588352}, 
{ 321000001, 538353577}, 
{ 322000001, 980581522}, 
{ 323000001, 326183677}, 
{ 324000001, 572317727}, 
{ 325000001, 255226407}, 
{ 326000001, 649183166}, 
{ 327000001, 601395295}, 
{ 328000001, 371921701}, 
{ 329000001, 803871263}, 
{ 330000001, 566114869}, 
{ 331000001, 627146251}, 
{ 332000001, 743908749}, 
{ 333000001, 776738749}, 
{ 334000001, 236447546}, 
{ 335000001, 621870992}, 
{ 336000001, 142947438}, 
{ 337000001, 325346539}, 
{ 338000001, 333357587}, 
{ 339000001, 474795016}, 
{ 340000001, 673499119}, 
{ 341000001, 528555548}, 
{ 342000001, 957194280}, 
{ 343000001, 136141870}, 
{ 344000001, 151585137}, 
{ 345000001, 636222967}, 
{ 346000001, 742442742}, 
{ 347000001, 356637091}, 
{ 348000001, 62336156}, 
{ 349000001, 602728751}, 
{ 350000001, 840260100}, 
{ 351000001, 894300632}, 
{ 352000001, 555763111}, 
{ 353000001, 164669381}, 
{ 354000001, 58864862}, 
{ 355000001, 605274385}, 
{ 356000001, 952792810}, 
{ 357000001, 416300551}, 
{ 358000001, 58975386}, 
{ 359000001, 324811362}, 
{ 360000001, 352356536}, 
{ 361000001, 785671564}, 
{ 362000001, 962435847}, 
{ 363000001, 68731029}, 
{ 364000001, 232485180}, 
{ 365000001, 510849444}, 
{ 366000001, 149142275}, 
{ 367000001, 105566139}, 
{ 368000001, 647506607}, 
{ 369000001, 588080572}, 
{ 370000001, 53839501}, 
{ 371000001, 90387244}, 
{ 372000001, 749033441}, 
{ 373000001, 110423383}, 
{ 374000001, 911060663}, 
{ 375000001, 514194465}, 
{ 376000001, 882846940}, 
{ 377000001, 516160743}, 
{ 378000001, 707137280}, 
{ 379000001, 200533857}, 
{ 380000001, 178657924}, 
{ 381000001, 555607668}, 
{ 382000001, 667390782}, 
{ 383000001, 245219574}, 
{ 384000001, 357352119}, 
{ 385000001, 492046360}, 
{ 386000001, 638743964}, 
{ 387000001, 24691537}, 
{ 388000001, 787115903}, 
{ 389000001, 280349069}, 
{ 390000001, 373444237}, 
{ 391000001, 956635248}, 
{ 392000001, 792789102}, 
{ 393000001, 955051508}, 
{ 394000001, 430785301}, 
{ 395000001, 273934501}, 
{ 396000001, 169887271}, 
{ 397000001, 563294886}, 
{ 398000001, 123626749}, 
{ 399000001, 954434908}, 
{ 400000001, 227300165}, 
{ 401000001, 112673002}, 
{ 402000001, 373893180}, 
{ 403000001, 54199837}, 
{ 404000001, 637061350}, 
{ 405000001, 519854486}, 
{ 406000001, 939553315}, 
{ 407000001, 681980692}, 
{ 408000001, 996930210}, 
{ 409000001, 120263839}, 
{ 410000001, 207172723}, 
{ 411000001, 254810458}, 
{ 412000001, 857699043}, 
{ 413000001, 233988454}, 
{ 414000001, 923583317}, 
{ 415000001, 622686362}, 
{ 416000001, 766734984}, 
{ 417000001, 746515458}, 
{ 418000001, 364670975}, 
{ 419000001, 570530467}, 
{ 420000001, 444208499}, 
{ 421000001, 568785064}, 
{ 422000001, 801102476}, 
{ 423000001, 278320916}, 
{ 424000001, 581011688}, 
{ 425000001, 693771264}, 
{ 426000001, 325547387}, 
{ 427000001, 404385343}, 
{ 428000001, 293665913}, 
{ 429000001, 985884408}, 
{ 430000001, 367531373}, 
{ 431000001, 580093282}, 
{ 432000001, 240489335}, 
{ 433000001, 321244888}, 
{ 434000001, 317141733}, 
{ 435000001, 566644864}, 
{ 436000001, 909655906}, 
{ 437000001, 85983999}, 
{ 438000001, 62531810}, 
{ 439000001, 532523519}, 
{ 440000001, 297449176}, 
{ 441000001, 466004208}, 
{ 442000001, 197210129}, 
{ 443000001, 643125656}, 
{ 444000001, 364058565}, 
{ 445000001, 817899263}, 
{ 446000001, 266083791}, 
{ 447000001, 32629606}, 
{ 448000001, 19866621}, 
{ 449000001, 536936916}, 
{ 450000001, 605324209}, 
{ 451000001, 943369557}, 
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{ 454000001, 188925146}, 
{ 455000001, 337342765}, 
{ 456000001, 951832734}, 
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{ 460000001, 729265513}, 
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{ 462000001, 535912440}, 
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{ 465000001, 430770292}, 
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{ 467000001, 996874160}, 
{ 468000001, 63067924}, 
{ 469000001, 542580831}, 
{ 470000001, 567907756}, 
{ 471000001, 672814847}, 
{ 472000001, 206118827}, 
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{ 474000001, 964873947}, 
{ 475000001, 52080967}, 
{ 476000001, 642022936}, 
{ 477000001, 677788962}, 
{ 478000001, 325689189}, 
{ 479000001, 18182882}, 
{ 480000001, 125889461}, 
{ 481000001, 974419170}, 
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{ 485000001, 23017262}, 
{ 486000001, 503751120}, 
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{ 490000001, 250743107}, 
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{ 493000001, 192916655}, 
{ 494000001, 618015062}, 
{ 495000001, 202087450}, 
{ 496000001, 624401755}, 
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{ 500000001, 666666670}, 
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{ 510000001, 598576559}, 
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{ 680000001, 530581}, 
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{ 722000001, 66025260}, 
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{ 1000000001, 808333339}
};

// X = a*Y + b
pair<string, long long> divide(string X, long long Y){
	string a = "";
	long long b = 0;

	for(int i=0; i<X.size(); i++){
		b *= 10;
		b += X[i] - '0';
		if(a.size() == 0){
			if(b/Y > 0) a.push_back(b/Y + '0');
		}else{
			a.push_back(b/Y + '0');
		}
		
		b %= Y;
	}
	return {a,b};
}

long long extgcd(long long a, long long b, long long &x, long long &y){
	long long d=a;
	if(b!=0){
		d = extgcd(b, a%b, y, x);
		y -= (a/b) * x;
	}else{
		x = 1;
		y = 0;
	}
	return d;
}

long long mod_inverse(long long a, long long m){
	if(a==0) return 1;
	long long x,y;
	extgcd(a,m,x,y);
	return (m+x%m)%m;
}

int main(){
	int T;
	cin >> T;
	while(T--){
		string c,p;
		cin >> c >> p;
		
		auto x = divide(p, MOD);
		if(x.first.size() > 0){
			cout << 0 << endl;
			continue;
		}

		long long P = x.second;

		auto y = divide(c, MOD);
		int C = y.second+1;
		C -= P;
		if(y.first.size()>0 && C<0) C += MOD;

		if( /*y.first.size()>0 &&*/ C-P+1 <= 0){
			cout << 0 << endl;
			continue;
		}


		auto itr_begin = upper_bound(built_in.begin(), built_in.end(), pair<int,int>{C-P+1-1, 1});
		itr_begin--;
		long long inv = itr_begin->second;
		for(int i=itr_begin->first+1; i<=C-P; i++){
			inv *= i;
			inv %= MOD;
		}
		inv = mod_inverse(inv, MOD);

		auto itr_end = upper_bound(built_in.begin(), built_in.end(), pair<int,int>{C, 0});
		itr_end--;
		long long tmp_val = itr_end->second;
		for(int i= itr_end->first+1; i<=C; i++){
			tmp_val *= i;
			tmp_val %= MOD;
		}
		long long ret = inv * tmp_val;
		ret %= MOD;

		cout << ret << endl;
	}

	return 0;
}